Seriously, its possible, why not do it? still keen for Hearthfire, just saying that there are some more things to add in that will make it more realistic.

pets are definitely included, on the official website it says that you can let your kids have pets, not sure about divorce though

We have 2 thread about this.
Pet: http://www.gamesas.com/topic/1407439-pets/

Discuss about Divorce here: http://www.gamesas.com/topic/1407328-skyrim-hearthfire-dlc-compilation-of-known-info/
By the way, welcome to the forum new guy!

PETS: Sounds cool enough. Wonder what kind of critters my kids'll bring home.
DIVORCE: Wouldn't do it if it was offered. But it wouldn't be that complex for the programmers to add in.