I put up a photo in my book about me and my husband that I have a photo of my mother and my uncle together.
Funnily enough they do look similar but as you know she was in Gryffindor and he was in Slytherin. I am guessing it was taken just after Severus started Hogwarts in 1971. So Severina would have been in her third year and in the same house as James Potter, Remus Lupin, Peter Pettigrew, Sirius Black, and Lily Evans.

I can only tell you what I have been told. She was protective of her little brother. I guess it didn't stop him getting picked on by certain people in the school though. She had been protective at home and she was protective then. You could say she was Brave to stand up to them.

I know they had a good relationship but being in different houses split them apart from each other.

Severina (Sevie) was put into Gryffindor, she was good at Duelling, Occlumency and anything to do with History. I'm sure that she would have been a Magihistorian or Curse breaker if she had lived longer.

Severus (Sev) was put into Slytherin and was good at Duelling, Occlumency and Potions.