I have a Martha A Reeves b.ca.1828 Sandhurst (by Cranbrook) daughter of John Reeves b.1794 Tenterden (not far from Sandhurst) - John married Mary Maynard of Sandhurst, John's parents are Samuel Reeves & Elizabeth Lambert. I have more generations back if there is a link - let me know. I have nothing on Siyver though.
Regards, Jeremy.