Looking for 2 Brothers

I am looking for 2 of my brothers Walter and James ! I believe they were born in Pa. They could have been born 1974-1976 they are not twins I have come to believe that Walter is older than James. I have found my BMother and siblings these to boys are the missing links! There was 7 of us all together 4 boys 3 girls . Myself ,Walter and James were the only 3 adopted out. My BMother passed away Sunday very sad day. Her wish was that we find the other 2 missing boys . Walter and I have the same mother and father which now both parents are gone but I want to find him desperately. Thank you ,Crystal