is a noterized Quick Claim Deed good if signed and Noterized

My Friend Died, and I was the Executor of his estates, That ended up being just his million dollar home,that he Had Signed over 1/2 interest in his Then also living mothers name . She died a week after he did. I Was the only one in his will , now that the probate has closed and his deceased mother, other Son Ended up getting over a Half million, I came across a Signed Notarized Quick Deed , from the year 2000 where his mother had signed that 1/2 interest back to him. but it was not recorded. is it valid, Do i have a leg to stand on to claim all of the proceeds from the sale of the home.