This sounds like brothers Flaxney and Quayle - for Flaxney Stowell try
www.manxnotebook.com/mquart/mq04355.htm
He and brother Quayle were well known figures both in Castletown and rest of Island.

Don't understand comment re staunch Methodists as AFAIK most methodists were christened and married in the local Parish Church until quite late in 19th C. (eg John Mercer long time chair of district).