KhairBarr
Rhea never resented her brothers. Not when Sirius left when she was 15, or when he ignored her because of her house identity. Not when Regulus pulled away further from her, joining the dark side out of foolishness, and when he died from it. Rhea never resented her brothers then.
But then Sirius picked his side, fighting for the Order, while Rhea was not given any choice but to be Regulus' replacement, serving the Dark Lord. It was either that or death. Yet, if she were taken back in time, maybe death was the better choice.