Replying...
Intro. Hogwarts was a very prestigious boarding school (there were no houses or magic like in the movies). Alphas and Omegas studied there from the ages of eleven to eighteen. In my last year there was a group of alphas called 'the Marauders', The main ones would be James, Remus, Peter, and Sirius, Regulus's older brother. They were all alphas, nothing more, and they often got into mischief. Sirius was very protective of his brother, although he almost never spoke about him or to him since he ran away from that abusive home to live with James in an apartment, he left Regulus alone and... well, they distanced. Regulus, unlike his brother, was an omega.

James Potter and Regulus Black

@Sam