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Criteria To Declare A Foster Sister
when I was breast feeding my daughter, my sister daughter was crying and my sister was not at home. I breast fed her just to stop her from crying . later I got to know that now she is my foster (رضائی) daughter and رضائ sister of all of my kids. Then my sister said now keep breast feeding her. So I breast fed her many times for about 1 month. But all this happened with out any planning.
My question is:
Is she رضائی sister of only my daughter who was breast feeding at that time or she is also رضائی sister of my son and he can not marry her.
please clarify this , if it is not prohibited according to Islam I would like to marry my son with her.
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