I found out yesterday that my LOs paternal grandmother has bought her the same item as what her Dad and I have bought her for her main Christmas present. She has given her the item already, and dropped it casually into conversation yesterday (I dont see her often, the reason me and her son are no longer together is because his parents dont think I am good enough for him.. his words).
When I've done a little bit of digging, it turns out shes bought this item AFTER shes been told what we've bought her for her main Christmas present.
It's not the first time something like this has happened, maybe I'm being precious but it seems deliberate. I cant decide if I should speak to her and explain, or not say anything so she doesn't know that shes upset me. Any advice?