I've reached the point where I don't add the information to any family tree without uploading a scan / picture of my source as an image. Frankly, I cite the original source so it can be found and reference in the comments tab where I started. Frankly, if Verizon goes down again, or cell towers after disasters, I want to know which land / will / register to go to. And if it was the index entry for the marriage, I copy that AND the cross reference. I only pull sources to records I can get an image of. I enter them ranked by surety (primary, secondary, tertiary) and tag.
When I see something changed on one of my directs on family search, I ask them for a copy of their source. If no answer or it's an "unsourced source", I change it back to my known good, and let them know. Politely, of course. I also put a comment in (as obvious as I can) saying don't change it, see (specific source attachment). It's a waste of my time if people keep changing it back, and it's worked for a couple of my records. 3rd great grfather born 1799 vs his cousin twice-removed born 1801 in the same county. It was getting changed and relationships deleted or not resolved every couple months. :: sigh ::
Sorry for the rant, but it's a solution that's working sometimes.