My son is using two apple accounts - one for iTunes purchases and the other for his regular iCloud like email etc. He has existing purchases for the iTunes. Here is issue: When adding him to my Family share, I used his account that contained old iTunes purchases. This account is not linked to Find my iPhone (that is his other account). Therefore his phone does not show up in my Find iPhone app because that is not the account which is linked to. I realize this is probably a rare case but just wonder if anyone else has problem.