In the sixth-season episode ''Father's Day'', the twins meet their biological father, Matt Sullivan, and learn that he is white and a famous photojournalist. Matt never married their mother, Racelle Gavin, because they never got the chance: she had been asked to paint a mural in Florida and he had been assigned ''the opportunity of a lifetime'' in the Middle East. Also, Racelle told him that she would later join him in Tel Aviv without telling him of her pregnancy. After six months, Racelle suddenly stopped writing. When the girls' mother died, Matt was not allowed to see them because he couldn't prove he was their father. When he searched for his twin daughters, he never found them because they had been adopted by two different people.

Can we conclude that did tia and tamera find their parents on sister sister?
yes