My husband is the grandson of Kate Fisher, a daughter of Andrew and Delia. Andrew has been a mystery but I do have information I could send you on our search so far which might help. Please email me at
joy.vanderven@frontier.com and I will send you what I have. I have some info on Delia, I have traced her back to Karsten Voogd in Amberg Germany in 1783. Have you been able to go further?