FindAGrave is a questionable source for research, I still agree, but sometimes the site provides some really good information. Margery Venables (16th great grandmother) and Randle Mainwaring (16 g-grandfather) memorials are an example. This couple is buried at Saint Lawrence Church in Over Peover, Cheshire, England. They have effigies and an ornate tomb. The whole Mainwaring family has a history at this Saint Lawrence church. This site: http://www.thornber.net/cheshire/htmlfiles/peover.html, created, I believe, by Craig Thornber contains several photographs and lots of information on the church, area and Mainwaring family.
Margery was born in 1369 in Cheshire England. Randle was her 2nd husband, they married in about 1391, both families have pretty developed genealogies through to Peter Bulkeley born 1592, founder of Concord, their 7th great grandchild. Randle was the 3rd son of William Mainwaring. Randle inherited all the titles and lands being the oldest surviving son when William died.