DH takes our DSs swimming most weekends, at a sports club where we are members. (I escape to the gym and leave them to it )
DH is lovely (if I do say so myself) and seems to have been adopted by every child under 10.
He is very happy to play with them, but his games involve a lot of throwing children about and there's a slightly older girl (or maybe well developed for her age iyswim) the older sister of one of DS1s friends, who has joined them recently. DH feels uncomfortable touching her, but doesn't want to leave her out. Or rather he feels uncomfortable about whether he "should" be touching her.
The parents are usually not present in/at the pool, but are well aware that DH plays with their son and that the girl is sometimes there too. He has spoken to the father in passing, but we don't know them well. What would you do?