I'm glad you have found the chart/timeline I created for William Marshal and some of the Magna Carta barons useful. I enjoyed making it, and enjoy even more sharing it.
I learned that the barons of 1215 England fully comprehended what we in our time call networking. They created the strongest possible ties of blood, marriage and oaths of fealty, the better to prosper and to protect their families and castles.
There are many more relationships between the Magna Carta barons than I could show in the one graph. The Magna Carta Barons and Their American Descendants linked here to a free digital copy at Archive.org, explores many more relationships between the surety barons.
It's a book by Charles Henry Browning, published in 1898. It has a fascinating chapter on the relationships between the surety barons starting on page sixty. Enjoy:)
PS Use any book that lacks sources cautiously, especially in establishing a pedigree from Americans to 1215. Modern writers like Douglas Richardson, who have surveyed all known sources, have documented the more certain pedigrees.