Fourteen sims have arrived in a deserted location to build a new town (maybe they're colonists of the past, founding a town on a new planet, or just a group setting out to form a new society). They have a broad range of individual goals, but they all want to see their descendants flourish.

How to begin:

• Make 7 adult male sims, one with each of aspiration. Use a variety of appearances and hair/eye/skin colours, and start each name with a different letter of the alphabet. Each man should be in a household of his own, and needs to move in to an empty 5x5 lot in town.
• Make 7 adult female sims, one with each aspiration. Use a variety of appearances and hair/eye/skin colours, and start each name with a different letter of the alphabet (and don't match any of the men). Make them as one household, and move them all in to an empty 4x4 lot.
• You may create up to 2 community lots. Don't go overboard.
• You will need a "No 20k handouts" mod. You can create a town with no townies, or use Visitor Controller to prevent them visiting community lots (and ignore walkbys). The original idea is not to use same sex pregnancy mods, but you are welcome to use sperm donors and/or surrogates (keep track of biological parents).
• You will probably want either mods that allow older teens to be "independent teens" and get jobs/ have children, or a realistic aging mod that shortens the teen life stage (at least relative to other stages).

Goals:

• Each man wants to have a son to inherit his house. The son needs to live in the household when his father dies, have his father's surname, and have the family's aspiration as either primary or secondary aspiration. The challenge continues until each household has a Generation 5 heir who is at least a teenager (the original adults are generation 1, so great great grandsons of the originals).
• The women have a collective goal: that by the time the challenge ends, all sims living in town younger than adult age are descended from all 7 of the original women.

Rules:

• You may use an maxis means of making money you like, apart from moving other sims in.
• You may use mods to give out up to 6 degrees to your starting sims (not with honours).
• The town does not have townies living in it, so you must ban townies from any community lots and ignore any townie walkbys. You may get to know a friend who comes home from work with your sim - they live in the nearby city - but not introduce them to other households.
• Female sims name all their descendants names beginning with the same letter as them. So Anna might have children Adrian and Alice, while Bella has Bessie and Bernard. If Bernard and Alice have children, they could be Alan Boris and Betty-Anne. Feel free to find new ways to track descent in generations 4 & 5 once sims have 4+ names.
• Babies live in their mother's household, and have their mother's surname (unless the parents are married and live together). You may not reload births to get a baby of a particular gender.
• There are two ways sims can join one of the men's households: by marriage, if the man wants to marry that sim and doesn't fear marriage/engagement; and a man can invite their newly-teenage son to move in if the two of them are best friends at that point (the son will then change his surname to his father's).
• Any descendant of any of the female sims can move into the women's original house at any time (and someone must always live there).
• New households must move into an empty lot funded by the household they are leaving.
• You may use whatever method you see fit to assign aspirations (and secondary aspirations) as long as the town keeps a variety of aspirations.

Stage 2:
Once your oldest members of Generation 2 reach their teenage years, you move on to Stage 2, which has a few different rules.

• You may add an empty Downtown to your town, and build 5 community lots there. Townies live Downtown, so at these community lots you may interact with townies.
• You may add an empty University to your town for any teens who need to earn a degree.
• Taxis and carpools are no longer available. Anyone with a job needs a car to get to work, and going to Downtown requires a car. You can walk to community lots in your main neighbourhood.
• Every 2 new households in your town earns one community lot, which you may place in either the main neighbourhood or Downtown. You do not have to delete community lots if you lose households, but you will need to replace the lost households before earning new community lots.
• There are no dorms at university - every student must rent their own house (or join a Greek house if you like). Every 2 occupied student households earn a university community lot.
• No-one may live Downtown, but if you have 30 households in your main neighbourhood you may add a shopping district for more space.

I think that's everything. It's partly inspired by legacies (but shorter, as there's no way I'm doing 10 generations), but also some thoughts about how the game processes genetics. I've been having fun so far, and will add a post with some pictures of my town.

Here are the 14 sims building Oasis Valley. I've played to the start of winter, and everyone has a job (apart from Sophie, who doesn't want one) and a roof over their head - though the quality of the men's houses varies a lot depending on how their first few days went.

Some romance has also happened. There are four couples going steady: Keith and Elizabeth (3 bolts, both Family), Donald and Abigail (3 bolts, Fortune and Popularity), John and Laura (2 bolts, Popularity and Pleasure), and George and Sophie (2 bolts, Pleasure and Cheese). My romance sims Richard and Monica have also met and seduced each other and are expecting a baby, but are very sure that marriage to each other is not in their future and will probably romance other people. Harriet, Oliver and William have been busy with other things (and William and Oliver were both very slow to meet any of the women), and Clare went on a date with John but he ultimately fell in love with Laura. She likes Richard, so that romance may happen in the future.

Here are some pictures to show how far my sims have got with house building at the start of winter. I'm using 4 day seasons, so they all started on Monday morning and it's now Saturday morning.

William Wyrd (Knowledge) has made the least progress. He's in the Science career, which doesn't pay all that well at early levels, and hasn't done any digging for treasure (or been on any dates). His house has four walls and a door, but doesn't have a floor or any windows (apart from the bathroom, which they all started with).

Richard Robinson (Romance) and John Jones (Popularity) have at least managed flooring and a couple of windows. They're also in fairly low paid jobs (Dance and Culinary respectively) and haven't been so lucky with the "dig for treasure" (or got any date rewards).

George Gardner (Pleasure) has been lucky with treasure and an expensive date reward. His hobby is nature, so he'll be growing a vegetable garden inside the stone walls on the left of his house in the spring.

Keith Kingsley (Family) has been lucky with treasure and an expensive date reward, and also has a fairly well paid job (Law Enforcement). His girlfriend wants to marry off 6 children, so he'll need plenty of space.

Donald Dunharrow (Fortune) has been lucky with treasure and an expensive date reward, and also got two promotions in Military (the highest paid job at early levels) before getting a job in Architecture (his LTW) and a promotion in that. So he's earned lots in a few different ways, and has the house to prove it.

Oliver Oswald (Cheese) has also found a treasure chest and been promoted three times in Education, so despite the lack of dates he's done well and has a nice house.

And the women's house reflect the much larger starting funds ($50,000) and the fact that there are six adults with a job rather than one. I don't have any screenshots of the inside, but it's something of a rambling house with rooms added on wherever they fitted, that suits the story for them.