Re: Nettie & Emma Nail
This is from the Social Security Death Index,
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Emma N Holt 8 Jan 1907 - Oct 1994 Last residence Denison, Grayson County TX Social Security Number 444-18-5094 issued in Oklahoma
George Holt 22 Feb 1900 - July 1979 Last Residence Denison, Grayson County TX SS number 446-03-4986 issued in Oklahoma
You can write the Social Security Administration and get the info from the Applications it may help.
There are 6 McGargle listed but no Nettie or Nelson.
I hope this helps some, James