Many, but not all, of the anti -pasteurization people believe that there is an invisible “life force” in the milk that is killed by processing. This is an old idea, but this unfalsifiable and unprovable “life force” thinking undergirds a lot of pseudoscience. People believe in getting energy aligned and unblocked and so on, and believe that drinking milk with mysterious life force is more natural.
Great grandfather’s sister’s grandson is your second cousin once removed. That guy is the second cousin of one of your parents because they share great grandparents with one of your parents. A grandparent’s sibling is a great aunt or great uncle to you. A great grandparent’s sibling is a great great uncle or great great aunt to you.