Looking for - Ethel Allen, Pam, Lisa ( Texas Area)

I found out that i have two aunts and a grandmother out there that i can't seem to find. My grandfather T.A. Pool and step grandmother Rose Pool got costody of my mother who is Debra Pool who was born in 1950. She was only 6 when she left home and she knew she had a sister named Pam, but not sure of her last name because of different dads but remembers it starting with a z for some reason or another. Later in life Debra went back to Texas and spoke with her grandmother who is Sue Appleton and she said that she had another sister by the name of Lisa. Sue Appleton said that both Pam & Lisa were given to some people for them to raise them who lived in Amarillo, Tx . Ethel Allen might have one sister named Susan and does have one brother by the name of David Allen. Ethel Allen was last known to be in San Antanio Tx. To Debra's knowledge Pam and Lisa were probably born in the Midland Tx, or Odessa Tx area. Pam would be around the age of 44 and Lisa would be 2 to 3 yeas younger than Pam. If anybody knows of something that can help me out, please let me know. That is my biggest dream to find them and i hope to do so one day. Thanks

My mother who is Debra Pool would love to meet them and i would love to find them for her as a gift to her and us. Being separeted from them was neither of there faults. It would be the biggest dream for me, Debra's daughter to find them.