Maiden name might have been Perthana COURTRIGHT and may have had a prior husband named John EVANS. unverified.
That would explain the three EVANS members of the THOMAS household in 1850.
[5378]the one named George EVANS might be the George M. EVANS who died in Wilkin Co., MN, 14 Feb 1918. Certificate Id 1918-MN-020925
unverified death date: 2 Jan 1851, Farmington.
possible mother: Louisa/Lovisa HOW/HOWE 1781-1842
possible father: James COURTRIGHT 1775-1842
possibly had 2 children by Henry THOMAS: John b. ca. 1843; Emily b. ca. 1851
Emily possibly married John MILLIKEN, 21 FEb 1868, Almont, Lapeer, Michigan.
However, a death cert. of Emily Ann MILLIKEN (25-MAR-1929, Owosso, MI) says her father was Ambrose THOMAS, not Henry.