Kids at a baby shower

Are you having your children and others kids at your shower? My MIL insist my stepson be apart or everything from popping the balloon at the gender reveal to being in the delivery room. Both I have said no to. 1. He doesn't care and 2. Hes 5 he has better things to do and wouldn't want to be there. He will be at his moms the weekend of my shower but the one my MIL is throwing me a shower aswell she said its like " a second birthday party for him too" he turned 5 in July and has had 4 birthday party's (he had so many because his moms side doesn't get along). I don't see why she wants people to bring both a shower present and a gift for my stepson. Even when I ask him about the baby he gets frustrated because he doesn't care lol.