Ominus was born into newly established House of Black. He was a wizard, and the eldest child of Sirius and Annalove Black. During his childhood he was brainwashed into believing non-magic folk were scum. When he was a child his sister Andromeda was born, and when he was in his late teenagehood his youngest sister Cedrella was born. He lived his childhood in maximum comfort due to the large Black family fortune. Ominus, along with his youngest sister Cedrella belived Sirius's idea of worthy citizens, refusing to bond with werewolves and humans.
Somewhere in his early adulthood, Ominus met the Crumblebottoms, and became romantically attatched to Bianca Crumblebottom, soon they were married and moved into the House of Black, where they had their eldest child, Narcissa, like Ominus, had a very luxurious childhood having the best of everything from toys to beds. Bianca wanted another child and Ominus wanted an heir so they decided to have another child. Elladora Black. Ominus soon reached full adulthood, and Bianca grew older as well, and they still didn't have a male heir, so they decided to give it one more shot and tried for a child, and that's how Reginald Black came to be.
His oldest child, Naricissa married new resident, Lucius Malfoy and had Draco Malfoy, Elladora (much to their disgust) married Charlus Figg (previously Joe MacDuff) and had Ignotus Figg, Reginald married well know fairy, Marigold Maldano and had two children, Nymphadora and Alexa Black. Ominus then died of old age, and Bianca became overly distressed and hung herself in the attic.