The Dumbledore family. Kendra and Percival Dumbledore. Three kids: Albus Dumbledore, the finest Headmaster of Hogwarts. Ariana Dumbledore, who the world thought was a squib. Aberforth Dumbledore, the goat-lover who was in his brother’s shadow.
Aberforth is like a big brotherly/sisterly sibling. The one who can even replace the mother sometimes. The one who can take care of the errant younger siblings.
And Albus, the snotty elder brother/sister. No, I’m not denying the fact that Albus loved his siblings. He really loved them. This is quite evident in Harry Potter and the Half-Blood Prince (Chapter: the Cave) But he was too consumed with his noble ideas – “For The Greater Good”. Having a friend of his level, Grindelwald, added wood to the fire. Like most teenagers, he messed up his priorities. He chose friends over family, leading to a fight with Aberforth, and an icy relationship after that.
Fights among siblings are as common and regular as rains in the monsoon season. Most siblings can’t gel well with each other, both having highly opinionated views of the other. But deep down, there is a feeling of love and care. It might not show in daily life. But when the difficult times strike, siblings will be the first ones to shed a tear and stand by you.