As per FindAGrave rules:
"Determine if you really need the memorial transferred to you for management. Transferring of management should only be requested If you have extensive changes to make to a memorial. You can add photos and suggest corrections without having to request management. Simply having someone in your family tree is not grounds for a management transfer request. With hundreds of thousands of contributors, we have many overlapping family trees and it would be impossible for all contributors to manage their entire tree."
"Transfer requests should be for direct relatives within four generations. This would be your siblings, parents, grandparents, great-grandparents, children, grandchildren, and great-grandchildren."
[NOTE: A DIRECT relative in NOT your cousin, uncle or aunt, niece or nephew, etc.]
"The goal is not to "own" every memorial of those to whom you are related. The ultimate goal should be to have meaningful, accurate memorials that honor those who have passed away, regardless of who created the memorial or who maintains it."
I have hundreds of relatives that I have found here on Find A Grave but I do not have "ownership" of their memorial pages. Find A Grave has created a wonderful tool, the "Virtual Cemetery", to help us to keep track of these relatives that have been added by our good volunteers. I have created Virtual Cemeteries for all branches of my family and find this to be a very efficient way to keep track of my family. Please use this tool instead of asking for transfers that fall outside the bounds of Find A Grave policy.