Confused

I think MC and Beta butlah-san share the same mother (but in butlah-san's case the mother gave the sperm).

Thanks for the explanation

If by MC you mean Aoi, the dark haired omega guy, no. He is not related to Miyaguchi (the butler). He is, instead, related to Jirou, the alpha (and what I assume is "mc's husband" to you). There's a clue in the names. The butler's first name is Ichirou and Jirou's name is, well, Jirou. The names translate to "first son" and "second son".

Sorry, Miyauchi, not Miyaguchi.

BTW, I also adore that Kudo and Miyauchi, first names Yuuto and Ichirou, name their son Yuuichi. It's a combination of both their names and that's so cute.

I know it’s super cute! I wish we get more of them. Also, Did one of the twins fell for Miyauchi?