Note:
necrofrigian = big chill
metanosian = swamp fire
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Family tree(all names are placeholders):
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Mc: bob(half human, quarter necrofrigian, quarter metanosian)
Mc's Mom: jane(human with alien ancestry. dies giving birth to mc)
Mc's Dad: John(human with alien ancestry)
Jane's dad: the metanosian(has that disquise mask dnaliens tend to use to apear human. He lives like a human)
Jane's mom: sara(human who died at jane's birth)
John's dad: the necrofrigian(doesn't know he has a kid outside the eggs he lays every 80 years)
John's mom: margaret(human who dies at John's birth)
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Family history:
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Necrofrigian goes out to buy some milk in another galaxy or something and john grows up at an orphanage, never knowing he has alien blood. Jane grows up with her metanosian dad but never tell john about her ancestry nor she knows that he has alien blood himself. When mc is born, the metanosian tells john that jane was half metanosian, but explains that the necrofrigian ancestry of mc must have come from john himself, john does not take it well and abandons the child with the metanosian. Mc grows up with his metanosian grandfather. The metanosian also then starts to try and find mc's necrofrigian grandparent
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Mc will look human, with retractable necrofrigian wings