So like a guy has a child in one marriage and his wife dies. And a girl has a child in a different marriage and her husband dies. Then they both get married. Their children of previous marriages can marry?
Step-siblings are not prohibited from marrying under current canon law.
Only the direct line of affinity is currently prohibited, so the man couldn’t marry the woman’s daughter. But his son could marry her daughter.
The prohibited degrees of affinity have varied significantly in the past. And in the past affinity beget affinity, but it doesn’t do so now. Meaning if Ann and Richard married, Ann’s sister Mary and Richard’s brother Mark became related via affinity, and would have required a dispensation to marry. That isn’t the case any longer, since the Fourth Lateran Council I think.
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