I've started a rags-to-riches legacy challenge where young adult sims move to an empty lot with no money and have to complete a house and an aspiration within certain parameters.

My first gen is living in Willow Creek and started in a 1x1 box with the mansion baron aspiration. He can't leave the house until he completes the aspirations. Has to work on one room at a time and it has to be "mansion baron" worthy before he can move on (no cheap kitchen units for him).

He's on normal life span and just aged up to adult. I don't want to change the lifespan but he's never going to complete this aspiration and have a child before he dies.

So, any suggestions on how to give him an heir that would make sense storywise?