About three weeks ago we got two male tiels. They are both relatively tame and will happily step up, sit with you etc etc.
However one of them (his name’s Bowie) has developed a huge favoritism for my dad. If he’s in the room he will cower away from anyone else and fly towards him, being incredibly loving. When my dad wasn’t around for a few days eventually he let me touch him and he became very affectionate with me, too, however as soon as my dad returned he went back to his shy ways. Any suggestions to solve this problem?