I don't believe Thomas Edward Green & Burchett Lundy had children---they married while in their 40's. Actually, they were distant in-laws. Their children from previous marriages married one another (Joseph Green & Ann Turner).
After the death of their spouses (Thomas' wife Mary Graves & Burchett's husband Joseph Turner), Burchett & Thomas married in 1743. So actually, Burchett married her son-in-law's father, and Thomas married his daughter-in-law's mother.