The origins of Thomas Leighton of Dover are unknown. Some genealogies list him as the son of Alexander Leighton, https://en.wikipedia.org/wiki/Alexander_Leighton. But there is no evidence for this connection. See https://www.wikitree.com/wiki/Leighton-288#_note-scales
I have severed the existing connection and locked relationships so that the connection does not come back.