Twin Boys born 3/57;ISO Bmother

Looking for my father and his twin brother's birth mother. They were born in Minnesota March 1st, 1957 and given the birth names of Michael and Martin. We were told the mother was originally from France, came here looking for the birth father, met a man from Minnesota and got married. The two were not able to keep the babies and they were adopted to Don and Joyce through Catholic Charities in St. Paul, Minnesota a few months after being born. Their adopted mother thinks she recalls the last name of "Allbright" for the mother. Any help would be greatly appreciated!!