
Ah sorry
I had a misunderstanding of your comment, I thought it was due to the twins being called gege by the little one.
I think the new little white hair boi is the mc biological little brother with the other white hair guy being his dad. Especially with the last art of the two parents I mtl the Chinese and it says something about how mc good features are from them.

No the family shown in chapter 27 is only MC family his only brother is the little one. The other two are childhood friend with him / grew up close like family NOT actual family. Chinese culture just tends to refer to people as big brother, big sister, little brother, little sister, auntie, uncle, grandma, etc etc either from politeness or closeness. This is not an incest story (ig unless u could A—>B<—C 3way as incest)
wait are they half brother with same father? can someone explain the family relationship with the mc?