I am researching one of my family lines from Finland. My grandmother was Helen Regina Roos (although americanized). Her father was Gabriel Gabrielsson Roos. His father was Gabriel Fredricsson Roos. His father was Fredric Mattsson Pihl (changed his name to Roos). His father was Matthias Martensson Pihl. His father was Marten Hansson.
That's as far as I can trace it at the moment. They came from the Pihl farm, in Toiby Finland.
I do have limited information on their wives, but any additional information will help.