Halakhah for Sanhedrin 56:4
ובעל אמו הוא ובנו וחתנו: בנו היינו אחיו
If so, [the difficulty remains,] he [i.e., his step-father's son]is HIS BROTHER! — He [the Tanna] enumerates both a paternal and a maternalbrother.
Sefer HaChinukh
Regarding the matter of one who was a relative and became distant (no longer a relative), we hold that he is proper (Sanhedrin 28b); and even if there are sons there - as the law is not like Rabbi Yehudah, who holds that if there are sons there, he is disqualified.
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