Muscatine Co., Iowa marriage records show marriages for
Elizabeth J. Slaughter to Samuel M. Mack and Mary E. Slaughter to
Thomas Martin. Both these marriages were on 27 March 1860 in
Muscatine Co., Iowa, which sounds like a double wedding of this
Elizabeth and her sister Mary. Their middle initials from the 1850
census match, the location is right, and they both would be the right
age to marry in 1860. Additionally, in the 1860 census,
Samuel and Elizabeth Mack are on the same census page as William
Slaughter (Elizabeth's father, who is living with his daughter
Louisa Stookey and family) and in 1870, there is a child Emma
Mack, age 9, living with William Slaughter (with the Bratt family).