My father's solution was to set aside every Saturday to play a full 18-hole round of golf. I grew up in a family of three children and he kept this up since the beginning (and still does). It did him wonders as a way to de-stress from his work, get physical exercise, and maintain a healthy social life outside of work, while still leaving time on the weekend to spend with family.
I don't have kids myself, but if I did I'd imagine I'd try to find something similar.