Sam has abusive older brother (not Dean)

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Hi! I'm looking for a specific fic that I've read before. Basically Sam isn't a Winchester and has an abusive older brother. They team up with Dean and John for a hunt (Sam's never met them before). Eventually I think Dean works out Sam is being abused and rescues him? I think Bobby turned up at some point too. That's all I can remember so if anyone can help me find it, I'd be grateful!

EDIT:Found!
The Broken Road That Led Me Straight To You by AlxM
https://m.fanfiction.net/s/8605037/1/