All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad, sallallahu ‘alayhi wa sallam, is His slave and Messenger.
The income earned by the son is his personal property. His parents, or anyone else, have no right to dispose of it, except with his permission. Asmaa', may Allah be pleased with her, narrated that the Prophet, sallallahu ‘alayhi wa sallam, said, "The wealth of a Muslim is not lawful (for anyone else) unless he gave it willingly." [Ahmad]
It is not correct to say in an absolute manner that the father has the right to take whatever he wants from his son's wealth even without his permission. Regarding the hadeeth that reads, "You and your wealth belong to your father," scholars who interpreted it underlined that there are certain conditions for this and that the hadeeth does not mean that the parents are entitled to dispose of their child's wealth freely with no restrictions or conditions. Please, refer to fatwas 1569 and 89942 for the correct interpretation of the hadeeth in reference.
As for providing for the parents, it is the duty of the child to provide for his parents if they are poor and have no wealth to provide for themselves, and it is not necessary that they are old or weak, so he provides for them according to his ability, as underlined in fatwa 90246.
Also, the man is obliged to provide for his wife in reasonable terms. We have previously underlined this in fatwas 83530 and 85541.
Allah knows best.