Hi Barbara; I am sorry that I did not notice this post. Maybe you will still get this. Perhaps we are cousins? Thaddeus/Tim was the son of Elizabeth Hooper and Mike Ahern. They may have come from the Maiden St. area of Newcastle, Limerick. Do you know anything else about Elizabeth and Mike? He seems to have been alive in 1856 but deceased by the 1860 census where the family is listed as "HERN".
In 1860 they lived in Saratoga, Grundy Co., Ill. with the p.o. address of Morris, Il. Elizabeth A. Hern age 60 housekeeper b. ire. John age 20 labourer James age 18 labourer Matthew age 16
next house. Timothy A. Hern 34 Bridget 34 Katherine 14 John 1