Having high clearance does not reveal character. Callen to Alex is a stranger. The man with him is too. Besides being the cause of your Mother's poisoning, leading to her death. Alex ought to be guarded with these people especially when her son is highly sensitive.
Home ownership has never changed Callen. Years in the same place and he is still isn't comfortable enough to put roots down – little furniture. Years of friendship/brotherhood with Sam, Callen keeps a certain distance.
What the writers have shown is people comfortable enough to have grandpa at home, a little kid playing with him, a daughter kissing her father goodbye, sharing coffee with her brother, and mentions of dinner. Acting as these people have known(open)each other for all their lives instead of months. That is what the writers wanted me to "see". Which is false.