I don't think we're going to get much more on Bern's past to be honest. I think Ryukishi is going to let it be up the the reader's decision as to whether or not Bern and Rika are truly related.
Though I could have sworn that one of the extra Umineko Tips was authored by Frederica Bernkastel. I think it was part of the Bernkastel's Letter Tip
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