A:
Firstly,
the said man has to treat his father kindly in word and deed as much as he can. There is nothing wrong with him working in another place, preferably in the same country, so that he can help his father.
Secondly,
it is permissible for him to
marry a pious and well-mannered woman, (Part No. 25; Page No. 230) but after consulting his father to please him.
Thirdly,
it is impermissible for him
to save anything from his father's money without his knowledge. This act entails dishonesty; he should rather ask his father to help him kindly and equitably.May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family and Companions!