I think some of these suggestions are getting a little complicated. Part of the appeal of VF is its simplicity. That said there are a few things I would like to see.

Baby - have a crib appear maybe a year (1 hour) after she first "got pregnant". Then she can go back to work and Dad can help.

Toddlers - Under 5's need more sleep so perhaps their energy levels could drop faster. And have them throw tantrums.

Teenagers - Let them refuse to pick up things and argue with their parents occassionally - like real teenagers.

Photo Album - can we take snapshots of the family as keepsakes for future generations.

Notes - Can we have more space here please. I like to make up a history for those who don't continue in the game. IE: Went to Europe and married a supermodel or joined the army.

Bad Eggs - Every family has them. Can we have a character field. "Angel, Good, Indifferent, Bad, Rotten to the core" The really bad ones can sit around smoking, drinking and generally being really lazy if you don't control them. And the angels will pick up things without being told.