William G Lafferty of Westmoreland CO PA Any Info

I need help with my Grandpa Lafferty,William George B.Lafferty was his full name and born april,25,1889 in westmoreland County PA. to William George and Annie (Craig)Lafferty William was born in Philadelphia City in March 1857 and Annie Craig was born in October of 1856 somewhere in PA. the Cenceus dont say Where?