ISO: Bio half-sister born St Johns in Fargo, ND abt 1975

Hello,I am looking for my husband's biological half-sister. She was born in Fargo, ND in abt 1975 at St Johns Hospital. Their birth mother named her Mary Kay Kaiser. I don't know if this name would have ever been shared. Their biological mother is Mary Lou Kaiser (DOB: 6/23/1953). They do not share the same father. My husband was born at the same hospital 2/8/1973. He was also placed for adoption right after birth. He has met their birth mother (I have as well). That is how he learned of his half-sister. Their mother shared that his half-sister is abt 2 1/2 yrs younger. Which would put the birth mid to late 1975 if the information is correct. They also have a younger brother who their mother did not place for adoption named John who was born 3/7/1981. If you were born at St John's in Fargo, ND abt 1975and this potentially sounds like you I would love to hear from you and we can figure out if it is or isn't.Thank you,Carissa (wife of Steve)