Looking for Margaret and Joan Pennington

I am searching for descendants of Margaret PENNINGTON born circa 1913 ( not sure where ) and Joan PENNINGTON born 1925 MADRAS India, who were the daughters of WILLIAM HENRY PENNINGTON and his wife Lilian nee HUMPHRISS. The family came originally from Stoke on Trent where William was a mineral water manufacturer. Lilian died in 1940 in Huyton, Liverpool and William in 1966 in the same area. Joan joined the R.A.F. or W.A.A.F. Thankyou for reading this. Elderberry