And you couldn't have two of Sirius' children without having the third! Meet Regulus James Black III, the youngest of Sirius and Embry's children! He's a Hufflepuff, very indecisive, clings a lot to his parents, started Auror training but was just about to look into becoming a professional Quidditch player! He also likes flirting, which has got him into trouble because in his last year of school, he got a sixth year pregnant, which led to the birth of his son, Jacob (Yes, I know, I know) Jacob's mother was getting sick because of her parents, so Regulus came back to make sure they're okay, and in turn, that Jacob stays okay.
He's a Hufflepuff, so he's friendly to everyone! Go show him some luff! I'm off to go have a little cry over the HP premiere (sobs!)