His brother only treats his parents in a harsh manner, and he is afraid that he has been bewitched
Question

                I am concerned about my eldest brother's behavior towards his family (mother, father, brothers and sister) There is a great change in his behavior, he doesn't talk with anyone, says hurtful things to his parents, and resents them, while he is nice to others.  I am suspecting his wife for doing some magic on him, please advise if my gut feeling is right, then what is the solution. Please do advise.
Praise be to Allah.Allaah has obliged sons to honour their 
    parents and He has forbidden them to disobey them. We have discussed some of their (parents’) rights in the answer to question no.
    5053. 
What you have said about your brother’s 
    treatment of your parents is an evil action and is a major sin. You have to advise him and remind him of what Allaah has enjoined upon him towards 
    his parents and relatives. 
It is not permissible for you to accuse 
    others of practicing witchcraft against your brother. The Prophet  (peace and blessings of Allaah be upon him) warned us against suspicion, 
    and told us that it is the falsest of speech. It was narrated from Abu Hurayrah that the Prophet  (peace and blessings of Allaah be upon him) 
    said: “Beware of suspicion, because suspicion is the falsest of speech; do not spy on one another, do not pry into others’ affairs, do not hate 
    one another; be brothers.” Narrated by al-Bukhaari, 4849; Muslim, 2563. 
So you have to look for the reasons why your 
    brother is doing this to you. There may be causes that you can put a stop to and help him to overcome. 
If there is no apparent reason, there is 
    nothing wrong with asking someone whose religious commitment and knowledge you trust to recite ruqyah for him and find out what is going on. If he 
    finds out that he has been bewitched, then you have to treat him with remedies that will remove that sihr (magic), remedies that are proven in the 
    Qur’aan and Sunnah. 
Whatever the case, such a situation requires 
    deliberation and wisdom in your dealing with him. Whether he is disobeying his Lord by treating his parents badly or he has been bewitched, he is 
    sick, and the sick person needs to be treated kindly in order to find the most suitable remedy for his condition.  
We ask Allaah to set the affairs of all the 
    Muslims straight. 
And Allaah is the Source of strength.