Here's where the tricky part of this line comes along. (This could be a little more tricky than Thomas Henry Lee changing his name to Henry Lee-Thomas). This concerns the marriage of Sarah Ann to John Lee. The link here is to their marriage certificate.
You will notice that the name for Sarah Ann is, "Sarah Ann Tysoe." It appears that Sarah Ann's mother (Sarah Thornton) was married twice: first to George Lever, and second to Joseph Tysoe. Most of Sarah Thornton's children were born of the marriage to Joseph Tysoe. Sarah Thornton had two children (Sarah Ann and Joseph) with George Lever and seven children with Joseph Tysoe. There is no proof that Joseph Tysoe actually adopted Sarah Ann and Joseph, but Sarah Ann gives Tysoe as her name when she married John Lee. This two marriage idea on Sarah Thornton is the consensus of the family (in Australia too) with the documents which we have currently. This could all change if future different proof comes to light. Anyone who would like to take this on?
In the future I will post many certificates from the John Lee/Sarah Ann Lever/Tysoe family and the Joseph Tysoe/Sarah Thornton family. For now just enjoy this certificate, study the Lee pedigree chart so that you can follow this along. Here is the link to the marriage certificate.