My DC go to a sitter's house for the summer. She is an upcoming college freshman. Her mom used to watch DC for a year when DS was about 18mos (DD was born within that year) until he was 2.5. Anyway, our sitter has a sister who is an upcoming 5th grader. Yesterday DS6 was doing multiplication. Sitter's mom asked him to help her daugther (the 5th grader), as she is still struggling with multiplication!!! DOH!