More than anything else, I like the unpredictability and real life feel of the game. Decorating the house is fun, but the characters that live there keep me coming back. With that in mind, I'd love to see more interactivity between peeps. For instance, the kids could go through a crawling stage, with both of the parents able to pick them up and care for them for a while, or put them in a play pen.

Some random thoughts,
Have the peeps change into PJs at night.
Have them take off clothes to shower. I'm not talking about a strip tease, just something innocent like instantly switching into wearing a towel going in and coming out.
When they are at the table eating, they turn their heads around to watch me in a uncomfortable looking way. Wish they'd stop doing that so much ... makes my neck ache just watching them.

Thanks for listening.