Sports are big in many families. Letting kids play sports is good for them in many ways. And having to take turns watching their siblings play too is a good thing to learn. Sometimes, participating with the sibling in their favorite sport can add a new dimension of fun for those who are not normally involved.
One year when my son was in canoeing, all the families were invited to be taken down the bayou by the student. He guided and directed us, led the instruction for paddling and took us to Mud Island. We all had a great time and it was good for us to be able to see what he had been doing, learning and enjoying.
Another time, when my daughter played volleyball for the YMCA and again tomorrow on her competitive team, the last practice is a girls vs. parents/siblings game. It is fun to get in on the game and see how much the girls have grown in their sport. And they love beating us, too!