I have some information about his family (he was keeper of the records in the Tower of London ?). The problem is that I will go on holiday and will not get back for some time. If you want you can contact me and I will have a look what I can find in the papers I've got (some letters, copy letters short, genealogy chart). I'm sure I can give you the names including births some death dates and names of some of the men/women they married to.
Please feel free to contact me if you have any questions - I can still read my mail while away.