Dot, More than happy to share what I have....The Avery bunch has been pretty well researched...Sarah is the daughter of Nathan and Mercy Burrows Avery...Nothing on Mercy Burrows parents, another challenge. I know nothing on Asa Alexander, but I will see what I can find. Will not be able to do too much on this for another week or so. You can email me and let me know where you are in your research. I will also get back to you.