adopted in 1973; catholic charities of Winona MN

I'm searching for my husbands birth mother or family members. He was born October 21st 1973 in Caldonia MN. He was adopted through Catholic Charities of Winona Mn. We have a little unidentifying information from a failed attempted to reunite in 1993. According to the letter he has two older male siblings one born in 1965 and on born in 1967, and two younger siblings, a female born in 1976 and a male born in 1978. He was told the birthfather died about 5 years before 1993. We would like to still to reunite and now the younger children are grown adults. We have two children and would love to reunite and meet with his birth family.~ dawn