Hi Patricia,
If you haven`t already found your GGGrandfather then you will find that his name is David
ARNOLD and I think he was christened 08-09-1825 in Machynlleth.
IGI Lists Thomas, Anne and Mary also but I am sure you would prefer to find them yourself
at Hugh Wallis`s website:
http://freepages.genealogy.rootsweb.com/~hughwallis/
If you haven`t used it before then scroll down, click `Wales`, new page, click
Montgomeryshire, new page, scroll to Machynlleth and click the first block of dates which
will then prompt you to put your research name in and search. The ARNOLD names will appear
and clicking on a name will give you the details.
Good hunting, Keith.