Is it permissible for a father whose income, pension, and business suffice him to give his business to his married son to provide for his household, and then take from his son who lives abroad, claiming that the father's income is insufficient, knowing that the son living abroad has a family and obligations and was the one who married off his younger brother?

It is permissible for a father to give his business to his married son who is in need or poor, even if it is by way of ownership. This allocation is permissible if it is for a compelling reason such as need or engagement in knowledge, and not out of favoritism. If the father becomes needy after the gift, it is permissible for him to take from the wealth of his other son to the extent of his need, provided he does not cause him hardship. As for a brother marrying off his younger brother, it is among the righteous deeds and great virtues due to its inclusion of honoring parents, maintaining kinship ties, and giving to relatives.