Hi, I don't know if you are still researching this but I am related by marriage to Vernon Sikkema "Doc" of Carroll, IA. He asked me to research his family tree and I am convinced he is a link to you. You have him listed as Lavern but his name is really Vernon and everyone calls him "Doc". His sisters were Jane and Jeanine and his father was Peter from Fulton, IL. Your grandfather Ralph was Peter's brother and I have found the Sikkema's in Holland back to 1791. It's like a puzzle and the Groningen website helps a lot. Let me know what you need and I will help if I can. Most of the infomation is on my tree and I can direct you if you need help.