Thank you for your reply - I should have provided the info on my gg-grandfather

Warren Elliott
b. 1813 in Cayuga, New York
d. 1882 in Benton Co., Iowa

He was married twice:
1 - Lucena Swet in Jan 1835 in New York, USA (1813-1841)
2 - Mary Catherine Smith in 1837 in Michigan? (1812-1895)

Known children of Warren Elliott:
1 - Vincent Elliott (b.about 1836-?) don't believe he ever married
2 - Mary Jane Elliott (1836-1899) married Edmund Rampton in 1858 and her children are mention in Warren's will by name.
3 - HL (Hannah) Elliott (b. about 1838-1861) haven't found any marriage info

1850: living with wife Catharine in Troy, Oakland, Michigan; also in home children: Mary (14), H.L (10 female) and Vincent (14 - listed as 'idiotic")

1860: Living with wife Catherine in Troy, Oakland, Michigan and a laborer Vincent Place (24)

1870: Living with wife Catherine in Jackson, Benton, Iowa. Also in home: Eva Collum (12), Mary Collum (10) and laborer Vincent Plane (32)

1880: Living with wife Catherine in Jackson, Benton, Iowa , also laborer Loren Place (46) [next door neighbor- Wm Libbey]

So the mystery continues on who these grandchildren are... Eva & Belle Libby