Possible twins?

Hi! Im playing my Milanese campaing and my only adopted son has 2 sons and 2 daughters, sons just got in age, they both Avoid the truth even if their father has nothing to do with speaking traits, and then they have few traits such as naive and dislike Venetians coming from the father, and both hate drinking etc etc...
They both are 16, im not sure if other one was born in winter and other summer, but their traits are scaringly same, without it being genetic.
Theres also Night Fighter and Religiously Proper.

I do think it's possible to get twins; have had it several times myself (2 children comming of age same turn, same parents)

Yeah, but they were quite same, only differences were genetic traits.

are they not from the same parents?

They were from same parents, they had little different genetic traits, since their father had more traits than i can count with all parts of my body ^^
But stuff that should be not-genetic came up with both of them.

that's probably just a coincidence, as I'd assume twins are supposed to have a good chance of getting the same/alike traits, it's reasonable to think that one of them got it by random, and the other got it as an unknown % chance becouse his twin brother got it

Yeah it´s coincidence, but scary one ^^