Playing with one's brother's wife is not permissible
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The fourth question of Fatwa No. ( 9868 )
Q4: Is it permissible to play with one's grandfather and with one's older brother's wife?
A4: It is not permissible for a man to play with his brother's wife; because she is not his mahram (a relative one may not marry). In fact, it is not permissible to shake her hand or to be alone with her. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Q4: Is it permissible to play with one's grandfather and with one's older brother's wife?
A4: It is not permissible for a man to play with his brother's wife; because she is not his mahram (a relative one may not marry). In fact, it is not permissible to shake her hand or to be alone with her. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.