My husband and I pray together occassionally, not everyday sadly. Our children are grown and gone but we pray a serenity prayer together almost daily, we pray at meals when we eat together and feel the need, and we pray for others (family members, friends, kids etc.) when we feel they have a special need, and when we are stressed . When we are having difficulties, financial, emotional or just struggling with things, we invite God into the equation and He usually works it out better than we could have imagined.
If people were really honest with themselves, I'm sure many more of us pray to a Higher Power, God as I call Him, then maybe would readily admit. Hang someone over a cliff and if they haven't been praying, I bet he/she might start.
But I don't think of God as a sugar daddy we pray and ask to give us our every desire either. There's the saying, be careful what you pray for, might get it-- and not be what you really wanted or have more troubles of it's own.
We usually try to ask for God's will in a situation especially if we don't know how to solve it.
Things I think parents can pray for with children:
their children's safety
children's future spouses(they realize God's in that choice too then)
children's spirtual lives
other family members, parents, siblings
With older children:
friends with health issues/deaths
social issues facing our country
concerns the children feel strongly about.