Looking for Birth mother

I am an adoptive child Megan, born Oct 27 1988 and I was adopted with my biological sister Alicia, born in Aug 11 1985. We are searching for our birth mother and/or father. All we know is that the birth moms name may be Diane Hose or Diana Hose. My mom (who adopted us) believes that was her name but does not remember anything else at the time of adoption. I was born at St Josephs hospital in Orange. MY sister and I have been searching for the longest time. Also, recently and unfortunately, my father passed away so my sister and I have broke hearts and yet we are still in the dark about where we even came from. Anything would help us. Megan