Well, when my Stepfather passed suddenly, my Mom was absolutely devastated. It was completely unexpected.
His ex did show up at the service. This is not an issue as they had children (adults now) together BUT she did stand in line to say to my Mom “From his first wife to his second, I am sorry for your loss.” (Or something like that)
My mom answered “And I want to thank you for not appreciating him and losing him, because we really loved each other, and the last 15 years were incredible” (or something like that)
Or something like that. His Ex is a bitch.
In a normal situation, if neither are evil and both have remarried, it should not be an issue, should it?