Regulus Black has a brother, that’s a fact well known in the wizarding world.
Nobody would talk about (or even talk to) Regulus without mentioning his older brother, Sirius.
Sirius Black has always been the center of attention, the heir of the Black family, the only Black to ever be in Gryffindor, a prankster, a rebel, and a lot of other things depending on who you ask.
But if you think Sirius is Regulus’ only sibling, you can’t be more wrong.
Regulus has 5 more siblings, Pandora, Barty, Evan, Dorcas, and Remus. Because just calling them his best friends would be plainly false. They were more than that. They were family.
They are always there for him, even when Sirius isn’t.
When Sirius left, it was them who took care of him. It was them who he would come to when he needed comfort or felt like the world was crumbling. Them.
They could never replace Sirius, that’s for sure, but they were his family as well.
Sirius might be his only sibling by blood, but Barty, Evan, Dorcas, Pandora, and Remus will always be his siblings by soul. Regulus couldn’t be more happy to have them.