What is the right of my siblings to the money I earned during my time abroad, and is what I give them considered a debt? And is my father entitled to give me a portion of his land in exchange for this money, knowing that the hadith "You and your wealth belong to your father" defines the rights of parents to my money, so what is the right of siblings?

Providing for well-off parents is recommended (mustahabb), and it becomes obligatory if they are poor, by scholarly consensus. The saying "you and your wealth belong to your father" does not grant the father absolute disposal over his son's wealth; rather, it is restricted by need and the absence of extravagance.

As for providing for siblings, it is obligatory for every heir, whether by fard (fixed share) or ta'sib (residuary heir), if they are poor, possess no wealth, and have no earnings, and if the one obligated to provide has surplus beyond the expenses of himself and his dependents.

Accordingly, the situation of the father and siblings should be considered: if they are poor and in need, then their maintenance is obligatory; otherwise, it is not.

If the aforementioned house was built with the intention of a loan and not a donation, then the questioner has the right to reclaim it. There is no harm for the father in singling out a son with a gift in return for what he spent, as preferential treatment for a legitimate need or a realized benefit is permissible in Islamic law. This is not considered prohibited favoritism (eethar).