Finding My Great Great Grandfather

My new goal is to find my great great grandfather Peters. I have been unable to find his first name and it seams the current information I have for him is not correct.

 I thought I had found a draft card from the only son I'm to know anything about (John Henry Peters, Oct 16 1891-Jul 31 1948) that stated he immigrated here with his parents in 1898. And the reasoning for his exception from draft was to his solely dependent mother.

But it's hard to make sure the draft card is to belong to him. It apereas to be him, however the birth information isn't correct.

After receiving an email from my 1st cousin 1x removed (Cindy Ann Bell Polehn, 1 Feb 1964) she had stated: " Her grandfather (John Henry Peters, Oct 16 1891-Jul 31 1948) was born in West Russia, very near the German border, spoke not only German, but some Russian too and came to the states as a lad. He had left behind his parents, and a disabled sister. He had a brother who lived in Canada, apparently due north of Minnesota, as my mom (Rosella Peters-Basom, 30 Jan 1921) put it".

My next step is to see if my grandfather (Raymond Paul Peters, Jan, 2 1926) can remember any information. The last time I spoke with him, he didn't know much. But maybe the story about the brother that moved to Canada will help.