There is a problem (difficult task), the question is general, the question must be dealt with, the problem must be solved. To whom?
In the family, in accordance with the Family Constitution,
If both want to decide, the one whose (to a greater extent) this question decides.
Whose territory is more likely and who is more willing to pay: who bears the cost of all arising circumstances and problems See Right to Acquisition of Rights
If both do not want to decide, the one whose issue it is, whose territory it is, decides.
Whose initiative was it, who promised to pay, who assumed responsibility, whose territory is rather.
My initiative is for me to do. Who (more) pays (reputation, time, strength, health), he is (more) the owner of the common territory.