Posting for a friend but for ease have written as if it's me.
DD has a tutor. SS struggles and would like to also have a tutor so I (with backing from DP) have arranged for the tutor to help both of them during our contact time with SS. His confidence in subject has improved immensely. However SS's mother has said she doesn't want him to have a tutor because he's not stupid and I've overstepped the mark. If we continue with this she will stop SS coming over. He's 12. I think shes being unreasonable. I'm paying btw and have not asked for any kind of contribution. What do you think?