>>88945722While she seems to be one of the friendliest sisters to her siblings (I believe Chris has said in an interview that she's the one Lincoln is closest to in terms of friendship), Luna seems like the biggest nightmare for their parents (April Fools Day aside)
It's shown that Luna was the straw that broke the camels back when it came to sleepovers when she trashed the house with a concert, that she's the one who will sneak and stay out past midnight, has been repeatably been shown to casually swear, and because there is zero soundproofing there's just no escaping her music practice. Along with Lincoln, she's also the only one who has been arrested in the show so far.
From a parents perspective, Luna is easily the "Problem Child"