I got your edit regarding sibling edits for John Cecil Hemmer (#13471200.)
Unfortunately, I can't do the linking. Siblings cannot be added via the siblings' pages. Sibling links are automatically generated by Find A Grave via shared parentage; that is, sibling links are generated based off the parents' memorials.
In order to create sibling links, the same parents need to be linked to each sibling (or one parent, which generates a half-sibling notation.)
I'm not the caretaker of Lena's, Emma's, or Florence's memorials, so I can't add parents to theirs. You'll need to submit edits for those, linking them to their parents, and then the script on the site will populate the sibling list accordingly.
Sorry I could do the linking from John's memorial! It'll be nice to see him linked up with the rest of his family, though.
Vincent Sulier I linked Agnes to her father Albert Sulier, but I did not create Vincent's memorial and don't have the access to make his link to Albert. Parents and childcan only be linked through the child's memorial. You will have to contact the creator of Vincent's Memorial and have that person link Vincent to Albert.
George & Rebecca & William Mackey Got the photos this morning and found one for William Mackey who is buried in the row directly above the others. I did not find the other one you requested, but as you can see from the second photo, there is open space on either side of both memorials - room for several other burials - although no other Mackeys are marked.
George Mackey and Rebecca Mackey I've claimed these photos at the Pleasant View Cemetery in St. Ignatius. I've taken more than 900 photos in that cemetery recently and will look for them next time I'm up there which should be sometime this next week.