ISO SISTER born in 1951, 1952, or 1953 in MO or Kansas

Searching for my sister given up for adoption in Missouri or Kansas around 1951, 1952, or 1953. Our moms name is Joanne Obermeyer. Born in Kansas City Missouri in 1931. She was approx 20-22 when she gave birth. She then moved to CA where she gave up our brother and then me. If you have your non identifying information, we are not on it since you are the oldest. I am your sister searching for over 25 years for you! If anyone can help or has info, please contact me at:Deenajamison@yahoo.comIf I don't answer, keep trying because it may go into my spam folder without my knowledge.