Is it permissible to refuse the father's request for 10,0 pounds for a government reclamation land for the marriage of the two orphaned brothers, with the possibility of the land being withdrawn?

If the father is in need of money and paying it would not harm the son or be unjust to him, then the son must pay it. However, if the father is not in need, or if the money would harm the son, then he is not obliged to pay, but it is commendable to please the father. If the father requests money to marry off the questioner's siblings in exchange for government reclamation land, the son is not obliged to comply, because his own two sons have a greater claim to his money. He should, however, do his best to satisfy his father. It is important to note that if "government reclamation land" was seized and taken without fair compensation, then it is not permissible to purchase it.