Hihi popping out of semi hiatus to catch up on things and I'll be back in soonish)
Gideon: Will know James well? He was on the qudditch team with James fellow chaser and in his year at school. He's also Deputy Head Auror of things so he'd be dealing with him in his work life as well.
Cassi: BEST BIG BROTHER OF ALL TIME. Ahem. She thinks of James as a big brother :-)