Hi, I have been able to trace most of the Slater children now.
Helen Slater, 1835-1927, m. David Hunter
Anna Slater, 1837-1919, m. Timothy Upton
Elizabeth Slater, 1839-1913, m(1). Robert Scrafield, m(2). George D. Hunter
H. Slater, 1840-1841
George Slater, c.1842-1871
Louisa Slater, c.1844-
Edward Slater, c.1846-, m. Sarah
Deborah Slater, 1850-1927, m. Edwin Wilks
I lost trace of Edward after 1880 in Chicago.
A few trees have Louisa as married to Asil Miles, but I don't think this is correct. I think they have the wrong Louisa.
Helpfully Elizabeth and Ann's death certificate both give their mother's surname as Bradley. There is no marriage between Henry Slater and Elizabeth Bradley in England, so I think that they must have married in New York. Henry's naturalization records show he immigrated in 1834 although I haven't been able to find a passenger list.
Still not sure what happened to Henry, seems he was alive when Elizabeth died in 1859, but no trace after that. I cannot find any of the family on the 1860 census.
Regards,
Alexander