Were Leo and Erica cousins or siblings, adopted siblings? SPOILERS
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Okay, last chance, :) SPOILERS:
I couldn't figure it out, she called Frank dad once but later on I swear she said something like "You always acted like my dad" leading me to believe she was adopted. Anyway, Frank mentions "that time when [Leo and her] were 15 and were caught together".
Either way, they are related right, so that explains Willie's reaction when he beats Erica and says "That's sick, your sick" when he finds out their past relationship, but I still can't figure out the connection. Was it blood related? Imagined?