I have in-laws in both areas. Wynnewood is exactly how you have stated. Lower Merion is part of the "Main Line" which my one in-law likes to throw around when she speaks of where she lives. "We are on the Main Line and it's so expensive here." Lots of history to it. Wynecote is more middle to upper middle, not as affluent as Wynnewood.
I have only found record of her father burying her grandfather but nothing more on him or that side of her family but I do know how to look through those PA records due to my family research.
I have many good things in my life, money doesn't happen to be one of them. We are from Massachusetts and 2 of my 3 kids go to school in PA. My son went to Villanova where he most assuredly felt the class/money issue but stuck it out to graduation. My daughter started at St. Joe's but the snobbery was too much for her and she transferred to Temple. The Main line is lovely. In Massachusetts my kids knew we were on the poor side but it was never a big deal in Philly, a whole different story!