Emmeline | Marcus is always looking for a drinking buddy AND he's also from PZ so there you go. Drinking buddies established. Done and done. I don't see any of my other kids having an issue with her so there's also that.
Oliver | PENNY LOVED HER BFF. Who else gives her piggy back rides when her legs get tired or ... you know ... let's her throw all sorts of Quidditch stats at him and actually understands them. Harry also knows him. Captain, My Captain. Then there's Marcus who has learned to be weirdly nice to Oliver so ... yeah, Ollie is busy.
Rabastan | I don't think any of my kids would have much of an issue with Rabastan ... maybe Penny but she'd likely just stay away from them. Marcus is still likely to invite him to poker night, so there's that!