Hi Marjorie, we have corresponded before about the Pulley family which I am descended from. I have recently found the family tree of Belisario Luque Marriott on MyHeritage.com (www.myheritage.com/site-24189772/luque-marriott). Perhaps you know it already. He is Ecuadorian but is descended from Thomas Marriott and Lucy Seymour. He gives Thomas's parents as another Thomas Marriott (d. 1775) and Webster Langdon (d. 1772). No further details about them or any previous generations.
He lists Lucy's parents as William Seymour and Martha but I have more on them from Margaret Miller on GenesReunited. William was b. ca. 1717 in Berkshire and Martha's maiden name was Watkins and she was b. in Berkshire in 1720. They were married 5 Feb 1743 in Avington, Berks. Margaret does not know any previous generations but does have a will for Martha's sister who left money or possessions to all William and Martha's children. Let me know if you want to be put into contact with Margaret.