His son refuses to spend on his divorced sister and her daughters
20-3-2011 | IslamWeb
Question:
SIR,I HAVE A SON AND A DAUGHTER ,MY DAUGHTER IS ELDER THAN A THE SON,THE DAUGHTER IS DUMP AND DEAF. AND WE MARRIED HER TWICE BUT NOBODY COULD TOLERATE HER AND THUS SHE IS DIVORCEE HAVING TWO KIDS 18 AND 15 YEARS AND BOTH ARE DAUGHTERS AND ARE FULLY DEPENDED ON ME.NOW I HAVE BEEN RETIRED AND ECONOMICALLY NOT SOUND. MY SON IS FEELING BURDEON ON HIM OF THESE THREE FAMININES AND TRIES TO WASH UP THESE SOME WHERE ON THE REPEATED CALLS OF HIS WIFE,WHO DOES NOT TOLERATE HERS. BEING THESE ISSUES MY BAHU ALWAYS QUARRELLS MY WIFE AND THESE GIRLS . MY SON HAS BEATEN MY WIFE(HISMOTHER) AND THREATENED ME TO MURDER. NOW CAN WE SAY HIM OUR SON OR HE IS DISCHARGED FROM ISLAM.
Answer:
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.
If what you mentioned is true that your son had beaten his mother and threatened to kill you, then this is a very serious matter and a grave major sin. Disobedience to parents is one of the gravest of major sins and if your son does not repent from it, then he is in great danger. So, he must be advised to repent and be warned of the bad consequences of his act in this life and in the Hereafter. For more benefit on disobedience to parents, please refer to Fataawa 87856 and 85041.
Nevertheless, a son’s disobedience to his parents does not drive him out of the fold of Islam, and if he dies upon this sin, then Allaah might punish him if He so wishes and He might forgive him if He so wishes as clarified in Fatwa 89494.
As regards spending on these two daughters, then if they do not have money, it is their father who is obliged to spend on them until they get married or become financially independent; for more benefit, please refer to Fatwa 130099.
If someone spends on them with the intention of asking their father to reimburse him/her for what he/she spent, it is permissible for him/her to do so. Ibn Taymiyyah 
said in response to a similar question that was asked to him: “Whatever they spend on them (the children) with the intention of asking their father to reimburse them for that, then they have the right to do so if he (their father) is legally responsible for their maintenance.”
With regard to their divorced mother who has no money, then it is her father [the questioner] who is obliged to spend on her, and if he has no money to spend on her, as it appears from the question, then it is her heirs (in case of death) – like her brother and her sister – who are obliged to spend on her, each according to his/her share of inheritance; for more benefit on spending on relatives, please refer to Fataawa 83470 and 85715.
Allaah Knows best.