The surname Turpeinen is found in Pielisjärvi. You might hunt there.
Brita could possibly be Riita.
Perhaps when the couple married, they took the wife's last name of Turpeinen.
Could this be your Brita: Anna Turpeinen with a passport issued in 5.1896. (Maybe Anna Brita?)
On the 1900 census, it gives a marriage year of 1894. Search for marriages around 1894 on HisKi.
Can you find a cemetery record for Brita in SD?
I can't find anything on Esais Isaac Turpeinen.