Looking for Ahrens

My mothers, mother name is Norma Ahrens..born ???? father Albert Ahrens, If mom remembers correctly. She was kept away from all info about he family, this is what i have...
Albert Ahrens- Possible--bith date March 9, ????
had 3 children...Elizabeth (Betty), Mildred, and Norma.
Norma married John Thomas Percy had one child Patricia Percy. Norma died when Patricia was 7.Buffalo, New York, USA..Any info would be greatful... Thank You Rick