I had an idea for 2 siblings, an older brother and a younger sibling. The older one is a somewhat arrogant man, but loves his younger sibling. The younger sibling has a puppet that talks to them or has some form of function to help or mess with them.
Then there's another sibling, who is quite similar to the younger one. However she (presumably female) has many other traits that the younger sibling doesn't. However this feels like it would not work since 2 siblings loving each other, with one being protective of them seems enough. And having another crazy sibling for the older brother to take care of seems too much for him. And not only that, I also don't feel confident since I rarely see any other media with 3 siblings and 2 of them being problematic but the oldest being sane; no, it usually is only 2 siblings, one being sane, one being crazy and problematic. I don't have much courage or confidence to make the girl a sibling and a character. in fact I almost thought of merging the girl and the younger sibling, but I'm at a loss. Any advice?