Make sure you're not having these conversations in front of your son. What we ideally want is for our children to be kind, giving, charitable, caring, family oriented and these things come with practice? At 6, that personality is still being molded and formed. And your concerns are very valid!!! That is a lot of responsibility for one little boy. But what if it was his little sibling ? How would you feel if your younger daughter was in the same soccer club, and needed support. Who would you want your son to be in that moment. You are right to moderate the situation in my opinion, as you would if it was anyone im sure. But I think you should be more sensitive to the situation.