At Christmas 3 years ago my DH came into our bedroom when I was staying with my parents and said my sister (also staying with my parents) had just ambushed him asking him questions and making comments about an aspect of my life. I was really hurt by it at the time and since but didn’t feel comfortable raising it with her.
Now, three years later, it became relevant in a conversation with my sister and I pointed out to her that she was being a hypocrite because she had ambushed DH.
She has responded categorically denying that it happened. DH is adamant that it did happen. I usually have a good relationship with both of them and they usually get on well. Neither have any previous issues with lying or inventing things.