I am not sure you have found the information you were seeking. I am trying to find information out regarding the Datema name Helen (Datema) Mennes is a daughter of Lucas or Lukas Datema, who is my Great Great Grandfather. She was married to a John Mennes. I have a newpaper clipping of John's Obituary. He died April 29, 1979, born January 21, 1881 in the Netherlands. He was formerly from Vicksburg, Michigan. Had son's by the names of Albert, Luke, Garrett and daughters by the name of Grace and Emma. Hope this helps.