The Children of Sirius Black {Harry Potter Fanfic}

What if Harry Potter had been mistakenly put into the wrong family?
The nurses' took the wrong baby from the incubator and gave him to the wrong parents, Lily and James Potter and named him Abraham.
Around that time, in the same Hospital Sirius and his wife, Medea had twins. One a girl, the other a boy. However they were told that the other hadn't made it - that he had died.
Little did they know that this child, was Lily and James Potter's son.

Throughout the twin's Very different lives, problems and obstacles will occur.
Such as-
Finding each other.
Voldemort.
Their father, Sirius Black getting into trouble.
The famous Trio, will eventually become a Quartet, Or will it?
Will Dumbledore Die? - Or is there a way around it, a cure?
And multiple other things, of course.

(Slow updates 😞 - I need to buy the first two movies, they're recorded on our living room tv which is in use until midnight.)