Hello,
I just wanted to add that I have found a document that shows that John Crew's daughter, Elizabeth, was Elizabeth Rust in 1723. Also, a John Rust was selling (1723) 1/3 of a lot in Lewes that once belonged John Crew, suggesting that Elizabeth Crew was married to John Rust in 1723. This then suggests that William Walls died sometime before 1723.

Also, I found a page in a Sussex County Deed book (volume Q16, page 293) that shows Sarah Bracy Walls (daughter of Richard Bracy) was the mother of a Jacob and a John Walls (both under the age of 17 in 1738.

Robin Walls