What happened to Alys River’s son?

Spoiler for the team black lurkers who can’t read….

But for everyone else, Aemond apparently fathered a child with Alys Rivers who survives the war, at least that’s what Alys says during her time as the witch queen of Harrenhal after the war. Now in the books, he and Alys literally just disappear from history…. I am just curious if anyone has any theories on what happens to that kid? Because there’s very little to go on here… not even some wild theories like he ends up becoming Craster or something…. No one seems to know where that kid ends up.