His children should be immune to those conversions as their bloodlines comes from a higher being and conversion means degrading or lowering their linage while being enslaved by lower beings.
In any case, thanks for the chapter.
Iām pretty sure, the new 4 maous participated in the war, they werenāt kids, hell Sirzechs meet Grayfia IN the war, when they were enemies, that was why their story was the most āromanticā in the whole underworld.