When my sims have the surrounded by family ltw (once with a game where I played really fast and the second time in the newest game where I wanted to adopt premades) they always instead end up subverting it and have kids by making robots (plumbots)

I think it’s because:

1) plumbots count as kids

2) sims 3 sims tend to be very interchangeable

So the ltw tries to be made up as soon as it can.