Probably born Enniskillen Fermanagh abt 1810, only an estimate based on daughter Catherines age. The 1850 census indicates she was born in Ireland , the 1870 census states New York, the 1880 census again states Connecticut USA, yet the 1910 census suggests she was born in Scotland, whilst the 1880 census suggests Connecticut, USA.
Date: 1850 Place: Bastrop, Texas, USA
Date: 1870 Place: Austin, Travis, Texas, USA
Ancestral File Number: 3HV2-GH
Husband: James B Cassidy
Date: BEF 1828
Place: Enniskillen, Co Fermanagh, Ireland
Alternate Marriage Date: ABT 1827 Albany, New York, USA
Her name is recorded as Margaret 'Cassida' in the 1846 and 1847 Texas Tax Rolls. 
↑ Veronica Williams for creating WikiTree profile Mcelroy-369 through the import of CASSIDY and SWEENEY 4_2013-08-13_2013-08-16.ged on Aug 16, 2013.
↑ 1850 United States Federal Census Page: Database online. Year: 1850; Census Place: , Bastrop, Texas; Roll: M432_908; Page: 153A; Image.
↑ 1870 United States Census Publication Page: Database online. Year: 1870; Census Place: Austin, Travis, Texas; Roll: M593_; Page: ; Image: .
↑ 1880 United States Federal Census Page: Database online. Year: 1880; Census Place: Austin, Travis, Texas; Roll: T9_1329; Family History Film: 1255329; Page: 191.2000; Enumeration District: 130; Image: .
↑ , 1900 United States Federal Census Page: Database online. Year: 1900; Census Place: Houston Ward 3, Harris, Texas; Roll: T623_1642; Page: 12B; Enumeration District: 81.
↑ Family Bible. Provided by Mary Fear USA, 1st March 2010. Given to her by her aunt before her death.
↑ The Church of Jesus Christ of Latter-day Saints Title: Ancestral File (R) Publication: Copyright (c) 1987, June 1998, data as of 5 January 1998; (Copyright (c) 1987, June 1998, data as of 5 January 1998). Page: CASSIDY to McElroy marriage - Record submitted after 1991 by a member of the LDS Church.
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It may be possible to confirm family relationships with Margaret by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Margaret: