help finding sibling

:) I need help Finding my sibling. I don't have a lot to go on I am not sure of the sex and I don't have a date of birth except I know the child was born in Covington Ky at St Elizabeth Hospital sometime in either 1955 or 1956. My mothers name at the time was Barbara Ann Jackson. Mother said the weather was warm when she had the baby. She said the adoption was through Mother of God church in Covington KY. Thats about all I know at this time. Any help would be appreciated.