Here is are the correct children. They are even cited in the " about " part, but someone has mixed up generations and added the grandchildren
Williams son Richard the priest was murdered which is a well known event.
https://books.google.com/books?id=I70PAAAAIAAJ&pg=PA723&lpg...
That was rather odd - a bad merge of some sort. Solved by disconnecting John le Fowler, III as parents