Doesn't look complicated to me. You settled the estate with your brother. You got the house, he got whatever. Now you want to blame the bank because the opportunity to deal with family members is gone.
The deed apparently wasn't recorded so there's no evidence that it ever existed. Even if there was extrinsic evidence of its existence (noted in your last comment) it would be moot because you already settled with your brother.
I think any action you take against the bank will come to naught but you are free to pursue it if you like.