Does a son have to spend on his father even if he is rich?

No File Exists
Check below answers in case you are looking for other related questions:
What is the maximum extent of the obligation to spend on one’s children?
Her husband has left Islam; is she entitled to maintenance during the 'iddah period?

No File Exists
Related Answers:
Spending on one's relatives
Is the husband obliged to spend on his wife if she is working? Does he have the right to take anything of her salary?
Her husband wants her to work outside the home
What is the maximum extent of the obligation to spend on one’s children?
Her husband has left Islam; is she entitled to maintenance during the 'iddah period?

Recommended answers for you:
Is it permissible to sell haraam things like pork to non-Muslims?
Ruling on drinking beer
What is a woman permitted to uncover in front of other women and mahrams?
Ruling on celebrating non-Muslim holidays and congratulating them
When should a person make the intention to fast, and what if he finds out during the day that Ramadan has begun?