Trying to find information about John Julseth

I'm trying to find some information about my great-grandfather whose name was John Julseth, actually I believe his name was Johan as that is what the grave marker says by his grave. I know that he was born in 1882 in Brandon, MN and he died in 1953. in the cemetary there are the graves of his parents but they only say mother and father, but no names. My grandma thinks that his mothers name was Berit and that must be correct because I found a death certificate for a Berit Julseth and it says that she died in 1926 and that is what the grave marker says. I don't know what her husbands name was, but I think it could possibly be Torsten, he died sometime in the 1890s. my great-grandfather had at least two brothers Thomas and Ludvig and at least one sister whose name, I believe, was Ellen. I'm trying to figure out when my great-grandfathers parents came from Norway, I believe they were married when they came but am not sure. I don't know for sure what part of Norway they came from either. Any help anyone can give me would be much appreciated!