My guess is that she lived her entire life in Allegheny County, Pennsylvania.
|1850 U.S. Federal Census, Allegheny Ward 3, Allegheny County, Pennsylvania;|
Roll: 744; Page 105B; Record for John Alston
The following are assumed to be their children, although not specifically stated:
John, age 16, occupation Carpenter, born in Scotland
William, age 8, born in Pennsylvania
Andrew, age 3, born in Pennsylvania
Lilly K., age 12, born in Pennsylvania
Margaret(h), age 10 (though looks like 19), born in Pennsylvania
Marion, age 4/12, born in Pennsylvania
Christine, age 4/12, born in Pennsylvania
And you can see in the far right-hand column that "twin" is noted for Marion and Christine. Based on the date that this census enumerator wrote at the top, 27th September 1850, I am estimating that the twins were born in May 1850.
The 1850 Census was taken over a period of five months beginning on June 1, 1850.
There are two additional members of this household (William Emson and Susan Helman) whom I cannot fit into this family except that the young man was born in Scotland and is a carpenter, so perhaps he came from the same Scottish community that the Alstons did.
|1860 U.S. Federal Census, Allegheny Ward 3, Allegheny County, Pennsylvania;|
Roll: 1067; Page 963; Record for John Alston
John is 54 years old, born in Scotland and is now a Master Carpenter. His personal estate is valued at $150. No household on this page lists the value of real estate, but since he owned real estate in 1850, my guess is he owned some in 1860.
New wife of John (and step-mom of quite a few), Marian is 50 years old and also born in Scotland.
The children listed here (all born in Pennsylvania) are:
Laily (Lilly?), age 22
Margaret, age 20
William, age 18, with an occupation of clerk
Andrew, age 12
Christiana and Marian, both age 10.
The youngest three are in school.
By 1870, some of the children have married and settled down in their own households. Remaining with father, John and stepmother, Mary [sic: s/b Marion], are four of his children.
1870 U.S. Federal Census, Allegheny Ward 4, Allegheny County, Pennsylvania;
Roll: 1291; Pages 377B and 378A; Record for John Alston (and family)
Andrew, age 22, a clerk
Lilly, age 33, "at home"
and on the next page, Christina and Mary [sic: s/b Marion], age 20. Marion married five years after this census was taken and Christina never married.