Hi again, I "bumped into" this query in another forum and read a wonderful reply with new info. So I checked other forums also. Hope you don't mind if I copy and paste your replies here.
The new (new to Genforum anyway) findings include a maiden name for Margaret Tobin and an immigration date for Morris Tobin.
From a poster on the Tobin Family Forum:
There is a Pedigree Resource File on Family Search that says that John Maurice Tobin was born 19 October 1858 at Worthington, Iowa, the son of Maurice Tobin and Mary Margaret Skahan. He married Elizabeth Isabell Tippett on 27 December 1881 at St. Augustine, Knox county, Illinois, and died 25 January 1947 at Fairmont, Minnesota. Elizabeth Isabell Tippett was born 22 October 1861 at St. Augustine, Illinois, and died 15 July 1851 at Fairmont, Minnesota. She was the daughter of George Robert Tippett and Mary N. Robey. The Pedigree Resource File is here:
From a poster on the Ireland Forum:
1860 US Census
North Fork, Delaware County, Iowa
Tobin, Morris, aged 35, farmer, born Ireland
Tobin, Margaret, aged 35, born Ireland
Tobin, James, aged 5, born Iowa
Tobin, Ellen, aged 4, born Iowa
Tobin, John, aged 2, born Iowa
The young age of the children suggests a later marriage for Morris and Margaret, perhaps in the US.
There is a naturalization record for a Morris Tobin in the Circuit Court in Delaware County, Iowa in the September term 1871, giving his age as 50; indicates he immigrated on 7/1/1852.
Found a marriage for a possible child which may give you an idea of Margaret's maiden name:
Jeremiah Tobin, age 48
Event: Marriage, 27 Nov 1918, Dubuque, Iowa
Father: Morris Tobin
Mother: Margaret Scahill
Spouse: Ida Hutton, age 39
Spouse's Father: Thomas Hutton
Spouse's Mother: Ellen Onichley
1880 US Census
Nilwood, Macoupin County, Illinois
Tobin, John, aged 25, boarder, works in coal mine, born Iowa, parents born Ireland
Tobin, James(hard to read), aged 21, boarder, works in coal mine, born Iowa, parents born Ireland
From a poster on the Minnesota forum:
Iowa, State Census Collection
Dodge, Dubuque, Iowa
Marrise Tobon 65 [= Morris Tobin], born abt 1820, Ireland, married
Anna Tobon 66
Roll: IA1885_180, Line: 20, Family Number: 111