Good afternoon Monica,
Something tells me that if I could find a census prior to the 1841 I may be able to solve my problems, but alas.....
This morning I worked for 4-5 hours strictly on agnes. I started with Scotspeople and concentrated fom 1760- 1804 for births and marriage's. The reason I started with 1760 is because a few trees state that both of their birthdays were 1762 even though I knew there was little chance that Agnes would have a 3 children in her 50's. Or at least I did not think so.
So I found 3 possible birth records for an Agnes in that time period.
30 April 1772, Father Patrick McDowall, Stranraer Parish
04 April 1778, Father James McDowell, Mother Helen McCoskrie, Stranaer Parish
15 Oct 1784, Father William McDowell, Mother Agnes McClurg, Kirkmaiden, Wig.
Those birthdates to me make more sense for the age of a mother from 1800-1808.
There were 4 marriages for an Agnes McDowell during that period but none to a George McDowell.
As far as death goes I checked on Scotspeople and hit a dead end. So my only option is to start looking into Ireland since John had that as his place of birth on the 1841 census. I think since I do not have a county though, I will only concentrate on the coastal counties across the sea from Wigtownshire.
I will take your advice on checking with other researchers, thanks for the tip.
My next move is going to try to piece together this James b. 1802 and Agnes b. 1802. I will try Scotspeople first.
I was lucky with the McKerlies tree. My husbands cousin Ellen traveled from California to Old Luce back in the early 70's. She passed away in 2001 and when my husband started a webpage for the Vyborny-McKerlie family her kids passed it on to him. She researched everything prior to the internet and handtyped it.
My husbands grandfather (and hers) was Alexander who was the son of James b. 1839 who was the son of James 1808.
Alexander married Roxie Doran in 1903. That was a little tricker to figure out but I have it back to 1825 in Franklin County, Va. and a lead possibly taking it back to the further generation in 1690 but I need to contact the Library of Virginia to ask them to please, please pull the file and send me a copy. At least I have the box number and file number.
Ah and then the Vyborny's. My husband already had them back to 1790 but try building a tree on Ancestry and typing all of those Czech names in, not fun. There is a Czech Vyborny site online that I can continue to link our family to but I am not in a rush to start typing those names again

So as to MY family? One was easy, there was already a book written on my mothers family (Duffields from England who immigrated to the US in 1682) so I have not bothered to build a tree since it is all over Ancestry.
My fathers is another story. I have made it back to my great grandfather who arrived in the US from Italy, Giovanni Senise in 1888 and hit a brick wall. So I totally understand.
What is the family information that you hit a brick wall on. Maybe someone else looking at it fresh may help. Trust me, I am getting burnt out on George and Agnes and want to pull my hair out.
Are you in Scotland?
Karen