You see that Big Bro smile.
He finally got that happy family time with his sister, even if she's still 99% tsun.
But the clone is still better than toxic original.
@Tamerlane Genetics are weird sometimes (my sister is the only family member having blond hair. And before you say "not related" there are other body features which very much imply familial relation with both my parents. )
And hair colour in manga is also not really reliable, being artificial and all.
@ckckckck Fair, though I doubt that either of them are heterozygous with the blonde hair gene. (Though, that being said, we haven't seen their family trees, and I'm just making that assumption off the fact they're all Asian.)