All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His Slave and Messenger.
First of all, may Allaah reward you for treading the path of guidance, as this is a great blessing that requires gratefulness to Allaah. Allaah says (what means): {They consider it a favor to you that they have accepted Islam. Say, ‘Do not consider your Islam favor to me. Rather, Allaah has conferred favor upon you that He has guided you to the faith, if you should be truthful.”}[Quran 49:17]
Among the best deeds to be grateful to Allaah in order to preserve this blessing is to seek beneficial knowledge, perform righteous deeds, attend circles of knowledge and keep company with righteous and pious people. May Allaah guide us and you to what pleases Him, and bless us with a good ending to our lives and protect us from sin.
There is no doubt that it is a great affliction that the parents are cruel to their children, and that they treat their children in a harsh intimidating manner instead of treating them with compassion and love. However, they remain parents for their children no matter what they do. The children must be kind and dutiful to them in all cases as we have previously clarified in Fataawa 87019 and 88254.
You should always keep in mind that they are your path to Paradise and this will help you bear the harm that may come from them. And ask for help from Allaah as there is no power nor might except through Him.
Part of dutifulness to parents is to supplicate Allaah to guide them to righteousness; Allaah says (what means): {And lower to them the wing of humility out of mercy and say, “My Lord, have mercy upon them as they brought me up [when I was] small.”}[Quran 17:24]
For some guidance on how to deal with tough parents, please refer to Fataawa 120291 and 230662.
Dear brother, we advise you to endeavor to forget their mistreatment to you as it is not good conduct nor is it liked in Islam or in custom for children to have rancor towards their parents.
There is no harm for children to hate their parents because of their bad behavior, but they must be careful not to harm them in any manner or lose patience with them or meet them with a stern face; Allaah says (what means): {….say not to them [so much as], “uff,” and do not repel them but speak to them a noble word.}[Quran 17:23]
Also, you should not consider doing good to them as a favor, as it is they who have the favor upon you as Allaah made them a cause for your existence in this world.
On the other hand, if you do not fear that your parents' state would become worse if you leave them, then you are not obliged to live with them in the same house; however, you should not resort to doing so unless you think that this would be of considerable benefit. Your presence with them, your advice and your good treatment to them may be a cause for their guidance.
Finally, it is worth mentioning that advising them indirectly might be more useful, for example, by having them listen to good touching lectures.
Allaah Knows best.