Home for unwed mothers Kansas City, MO 1954

My cousin was born at Crittenton in 1956 to Donna Jean Johnson, a 14 year old blonde. I have been working with my cousin for a few years trying to identifying his birth father. Through DNA testing we have discovered who we think was his father, but since he died in 1992 and his mother died in 1968, we are trying to discover how we can further prove what we believe is true.Can anyone here give us ideas of where to turn now. I plan to contact the Kansas City courts system to see if there is anyone there that can look up his records, we have his adoption case number.Glen