"Does he have the right do such thing?"

No. Tell him for the safety of the kids he has to give you the address so you can check it out on their behalf. If not, then get legal counsel.

M-43 W-40
2D - 9 and 5

Emotion, yet peace.
Ignorance, yet knowledge.
Passion, yet serenity.
Chaos, yet harmony.
Death, yet a new life.

RECONCILED AND WISER