mcem - thanks for your post, I agree, children are the responsibility of both their parents, and father's are certainly not "baby sitting" for the children's mother if they are caring for their own children.
I feel this thread is taking an unpleasant anti working parents/mother tone, something grandparents would be better to avoid where possible. These are very different social and economic times than they were when mortgage lenders assumed women would soon have children and give up work, so would lend only on one salary (i.e. the man's). I'm in the north west, where property and rental is so much cheaper than in the south east. It's still difficult for young families to manage without two incomes. The Scandinavian countries don't have this bias about women working, they seem to function with good child care provision and parents much more likely to share child care responsibilities. what's not to like?