Good luck with all that.
I am afraid that I gave the wrong name for her brother. He was a John Lillywhite. He is a direct ancestor of my wife. Thomas was the father of John and Elizabeth.
John is an interesting case. We don't know why he was in Norfolk, claiming to be a gamekeeper, when he got married just outside Norwich in 1802. Then he disappeared from the available records until he christened a daughter in Windsor in 1808. In the interval, he had had an earlier daughter and acquired considerable wealth.
I am sure that there must be more information about him out there somewhere.
All the best,
Bill