Why, isn't possession a commutative property? If Yudhi owned Bhima, and Bhima owned Hidimbi, didn't Yudhi as a result own Hidimbi?
No younger brothers(in the absence of father) are property but their wives and children are solely the property of their husband/father (one point Draupadi raised about how could Yudhishtir stake her when there were her other husbands too)
This is pretty clear in Manusmriti (although it doesn't use the word Property)