Danaerys has been told about a million times now by trusted advisors that her father was a crazy shitstain. She's got beef with all the major houses in Westeros but she warmed up to Tyrion, Jorah and Selmy so she could eventually do the same for Jamie if he's compliant.
I don't see any type of marriage alliance between Targs and Lannisters though. Once Cersei dies there'll basically be no real power left in that family. Jamie will be the only one worth a shit left breathing.
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