I loved Sims 2, I ended up about 5 generations down from the original starter families. Remember the single mum Brandi who lived in a trailer with Beau and Dustin the teenager. I had him marry one of the ginger twins, and Brandi adopted about 10 kids and I used the cheat to make her rich and live in a big house. Don Lothario got her pregnant again aswell.
There was that aging potion as well that you could drink to make an elder an adult again, so you would have a weird situation where parents were younger than the children
Loved the University expansion pack, nightlife, and open for business. Game changer was discovering you could make the radio stations play your own music by putting your mp3 files in the programme files, so loads of songs from 2006-2009 remind me of sims 2!!