Saturday, the day before Mother's Day, I had a Mother/Daughter "All About Me" book class. The Mothers made a 6"x6" book and the daughters made an identical 4"x4" book.
I had 18 people sign up, and we had a great time! Some of them were actually Grandmother/Granddaughter, or two grown Mom/Daughter. Either way, it worked for ages 7 to 60+. How many other hobbies can span that many ages?