(LMFAO IT'S OK it literally just occurred to me too skjdfhkj. But I think it's like... he sees Diego as family, but does not see Mina and Estella as family bc lack of [honestly dubious] genetic link. Still, they are Diego's sisters, so they are strictly off-limits when it comes to... flirting or being mean or w/e. He just leaves the Tran sisters alone normally. Bro code. :C)