Reference your Mead Family from New York.
Gilbert D Haggart bn 1803 Died 22 Dec 1866 Fulton Co New York was married to Julia Mead c 1800-1810 she died before 1855.
Gilbert's brother Daniel Haggart b bet 1805-07 Johnstown New York was married to Caroline Mead c 1811 b New York they were living in New York in the 1850 Census but by the 1860 Census they were living in Erin, Stephenson, Illinois. The only other info I have on Caroline is her father was Charles Mead bn New York and her mother Caroline who also was born in New York.
I don't know if this is any help in linking I have a lot of info on the Haggart side of the family from Daniel 1 1741 b Scotland and the present day Haggarts