I have twin boys who are 7 and one older son who is 19.
Here is my plan for scapping. Each of the boys has their own book. Things like, school pictures, sports pictures, Birthdays etc. I also include in those special pictures I love that I scrap. So if I find one of my older son, I scrap it and put it in his book.
Family trips are just that. Family trips. I scrap one book for the family. They can divide them up how they see fit.
That's just my plan this far.
Hope it helps.