Is it permissible for children to gather money and help their parents perform the Hajj pilgrimage under the aforementioned circumstances?

The children's cooperation in collecting money for their parents' Hajj is an act of righteousness and one of the greatest acts of devotion. However, it is not permissible for a child who is able to perform Hajj to prioritize their parents for it, because Hajj becomes immediately obligatory upon them, and this is the most preponderant opinion.