So who's Damien's mother...his grandmother (since Taran+Taran=boy & Taran+Outsider=gir...

No because Damien isn’t Hugo’s son so he may be Hugo’s twin brothers son or his younger brother

If you wanna know
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Damien is ml brothers child, and he had it with his cousin and I think they loved each other. (I might be remembering wrong and could be sister but I’m pretty sure it’s cousin)

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His brother fell in love with a village girl that happened to be his half sister(I don't remember if it was a deliberate plan and I don't think the girl knew either).

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Damián is Hugo's son. Hugo fell in love with his half sister and Damian was made. She died during giving birth, I think. but she's dead

i mean he's the twin brother's son

Oooo half sister, damn I thought it was cousin but still kinda weird

Correctly u are right his twin brother name is Hugo whereas his name is Hue (if im not wrong)

yeah I remember that hue took Hugo's name, to solidify his position as duke

So in short Damian is Hugo’s son from his sister and hue took Hugo’s name to become duke

yep.