Under their Partners, press What are you trying to fix? and choose the option saying one of their partners is the wrong person. Then say who it should be. Because children are involved, we check each child stays with the right parents – nothing moves without you saying so. For example, if the tree shows your uncle married to the wrong woman, swap in his real wife and decide about each child in turn.
Where to find it
Person page (Safe edit on) → under Parents, Partners or Children → What are you trying to fix?
Only people with the "Add people" and "Remove" ticks, with Safe edit on.
Still stuck? Talk to a real person: send us a message, or email support@mywholefamilytree.com