Chimera possibly? It's not unheard of for "twins" to have different sires, and chimerism could occur between half-sibling twins. Theoretically.
Anybody with more experience with twins and/or chimeras feel free to tell me if I'm wrong, but when you take Occam's Razor to the situation this makes sense to me.
Anyway, I'm super jealous over here! What a hot little baby! Feel free to send it my way if you don't want it
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