Is money sent by parents who do not provide for their highly religious son, who sleeps in the mosque, considered charity?

You have done well in choosing a person of religiousness and good character, in compliance with the command of the Messenger of Allah (peace be upon him): "If someone whose religion and character you approve comes to you proposing marriage, then marry him." The money you pay him is considered a good deed, and whether it is charity or something else depends on your intention, for the Prophet (peace be upon him) said: "Indeed, actions are by intentions." If your intention is zakat (definition), then it is permissible to give it to him if he is among the eight categories mentioned in the verse from Surat At-Tawbah (definition): "Indeed, [prescribed] charities are only for the poor and the needy, and those employed to collect [zakat], and for bringing hearts together [for Islam], and for freeing captives [or slaves], and for those in debt, and for the cause of Allah, and for the wayfarer."