I have travelled with Mrs TK and 2 lads 13 and 15 and had no problems with TG and NZ in gaining access to lounges when travelling in Y as *G / ROP G. My presumption was that Mrs TK is my guest, and responsible parents don't abandon their kids at the lounge door.

Also, When I was flying TG F, and lads in C (same flight), no problems in getting both kids in F lounge in BKK.