I sure did a lot of photography when our kids were home. Baby, child, sports, band, dance, shooting, motorcycles - everything they did was documented. Now that they are grown and have their spouses and kids, I let them do the family documentary, and I trend more to the fine art stuff. Of course, the grandkids cause a lot of film to be used too.
My Wife's interest was as a seamstress. She made beautiful ball gowns and such. With the kids, she just incorporated kids clothes in the mix. We never thought of dropping our interests, we just accommodated the kids in them.