My great grandmother was Hanna Josefina Wiberg born in Sweden, immigrated to RI State with her family at age 6/7 yrs. She married Robert Arthur Tanner in 1894.
The Wiberg family (Hanna had 10 brothers and sisters come with her from Sweden) had a large gathering of them in the RI area, with a number of them fanning out to CT state as well as farther west. I am uncertain of how far as I've not actually done research along those branches of the family.
The Wiberg's I belong to are from Aryt, Timmele Parish, Sweden.
Hanna's father Johan Nathanael Wiberg was born in Nolkvarn Åkersdal, Fivlered, Falkoping, Skaraborgs lan, Sweden.
If this bring us together, then we can both maybe do some comparisons and find your missing Wiberg.. yah?