There is a website called "American Silversmiths" that has lots of genealogy information from the 1600 & 1700s, and there are 9 Tewkesbury's listed there. Scroll down to Tewkesbury and click on any name for information. The link for the site is listed below.
Joyce
http://freepages.genealogy.rootsweb.com/~silversmiths/names2...