I could see it going both way, honestly. I think both create drama for different reasons.
Girl: the “new” daughter that Snow wants. Drama = jealousy BUT on the flip side it would eventually force Snow and Emma to bond as mother and daughter
Son: possibly replaces Emma as heir to the throne. We don’t know *how* succession works in FTL and we’ve talked about it before, but a Prince might have a greater hold on the throne than Emma, who wasn’t raised royal.
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"He was a lot of things to me" "The only conclusion was love"