It's actually a curse.
His father betrayed the clan therefore died leaving 2 twins behind ( it was translated as birth but more like he died bcs 2 children come out of his stomach you know tearing him sort of and he died the horrific death. There's a legend attached to twin's birth to) legend is when after the birth of powerful swordmaster and eyeless dragon they'll fought to death untill only one remain standing and bring forth the peace to the world something like that (it was in novel)
Respectfully,Disagree my lord. Adam and eve weren't the byproduct of mere pregnancy despite that they were called children of God and that doesn't make God their 'biological' father but the creator. likewise bro can not be called pregnant. ( I fully agree with Mpreg point i made a comment about that as well but it's fun to engage in most nonsensical arguments and I love it *index finger up +nerd emoji*)
Nuh-uh to your opinion with grace sire, Adam and eve were the byproduct of a immortal omnipotent all powerful god, While the MC father is a mortal man who betrayed and cursed with "birthing" his children which in fact makes them biological sharing the same ancestry/bloodline. ( While this bro father is not fathering but bro's in fact mothering i rest my case
MPREG Is crazyyy was not expecting that lmaoo RAHHH MY HERALD OMEGA KING