Do not obey him but treat him kindly.
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Belonging to faith must be given precedence over lineage and other worldly affairs. If a relative asked you to disobey Allah, do not obey him, but do not be rude to him.
Allah said ( interpretation of the meaning ) :
{ Say, [O Muḥammad], "If your fathers, your sons, your brothers, your wives, your relatives, wealth which you have obtained, commerce wherein you fear decline, and dwellings with which you are pleased are more beloved to you than Allah and His Messenger and jihād [i.e., striving] in His cause, then wait until Allah executes His command. And Allah does not guide the defiantly disobedient people." }
AT-TAWBAH (24)