Thank you both CarolW and Aghadowery for your attention.
I will try to clarify my story.
First, let me say to CarolW that you do have the correct family. However, that was a later date. I have been told that my grandmother wanted to return to Scotland. Once there, it took her a few months to realize she made a mistake and wanted to return to the USA. (Grandpa was a good guy!)
My grandmother Esther Ferns was born in 1876 and was married to two brothers. The first husband was James Duffy b 4/24/1879 in Londonderry. At this time, I can only assume he and Esther were married in Glasgow, Scotland. I know James died there in 1912 but I don,t have documentation yet. They had children john, Elizabeth, Esther and Catherine. I have been told they also had an 11 year old daughter Mary that died within six months of James. Sadly enough, Esther's father John Ferns died in 1912 as well. she lost three love ones that year.
I have the ship passenger list for the Merion that left Liverpool, England on 1913. John Duffy b 10/3/1887 in Londonderry accompanied Esther Duffy and her four children. looking under a magnifying glass I could make out the words bros in law next to johns name.
John and Esther were married here in Pa, USA. My father James A Duffy b 6/10/1916 was their only child. john assumed the role of father to Esther's other 4 children.
To Aghadowery, my answer regarding Scotland's census. I could only find James, Esther and baby John in 1901 census. Scotland's 1911 census does not show on ancestry .com. Is there a site out there where I can find that census for free?
Thanks for any further help.