[Lylirra does some research]
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[Lylirra enters the library asking for a list of known nobles who married common women (or had notable affairs with them) that resulted in children and in particular cases where the man left the woman after the fact]
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[After looking a bit, she also inquires if any of these women had killed their children and self after the seperation]
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She finds a lot. The list of nobles who divorced their commoner wives despite children is quite short, and she does find the address of one such noble who still lives, though no details on the commoner woman or her children.
Marcus Tradegard. Maybe his address will be a start...