It was explained in AGMGTW that being conceived in the Tardis warped Melody’s DNA so it resembled that of a Time Lord. Thus she is still the Ponds’ daughter while being a bit Time Lord.
I really, really hope Moffat doesn’t kill them off. I’m far too emotionally invested in both of them, it would be too upsetting. I’ll be sad to see them go, but it’ll be ok as long as they’re granted a happy ending.
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@chris
I don’t think Moffat will kill either of them off – he’s gone so far into establishing their love that to kill one would be too awful. Still – it’s Steven Moffat, I suppose.
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