Right now, not enough is known about Joanie's circumstances and in real life, maybe, but this is fiction and could be a good storyline ....
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Kerry helped Amy with taking Kyle from playschool and they were going to Ireland .. Cain found out and managed to get Amy to go on her own. Amy returned found out where Joanie lived and befriended her before Joanie found out that Amy is Kyle's birth mother, plenty of history there for Joanie not liking Kerry very much ..I think this is how it went ...