I was hoping someone would know the meaning of the initials after some (witnesses?) on the marriage records:

Marriage Records Fayette County, Kentucky Volume II 1810-14.

example:

Name: James Perkins
Spouse: Lydia Moffett
Marriage Date: 16 Jan 1810
Henry Poague, B.; Susannah Moffett, M.

I am guessing that M stands for mother and B stands for brother. I notice when looking through the various records, some say "M of groom," etc., but there are also designations that aren't as obvious to me. Like W (and it's not wife). And some of the "B" designations have different last names. Enough that I think it might sometimes be a brother-in-law or have some other meaning.

If there is a place that explains these designations, please let me know. Or if you are aware of what they mean. Or just want to give some educated guesses to throw in with mine!

Thank you.