Earlier quoted context omitted.
It can be a challenging skill to apply, and you need to use your judgement to discern whether the other person is in a place to engage with what you say. One comment I'd make is the difference between "valid" and "rational". Emotions and feelings are always "valid", in the sense that they are a natural consequence of events and prior conditioning. But feelings are rarely "rational" - they often don't reflect the comp…
> Emotions and feelings are always "valid", in the sense that they are a natural consequence of events and prior conditioning. If “validating” someone’s emotions comes down to simply saying that, yes, I agree you felt that way, then I suppose that’s true. But when people talk about validating other people’s emotions it implies that they’re saying the emotional response was valid for the circumstances. I have someone…
> Emotional validation is a process which involves acknowledging and accepting another individual's inner emotional experience, without necessarily agreeing with or justifying it, and possibly also communicating that acceptance.
https://en.wikipedia.org/wiki/Emotional_validation
It sounds perhaps like your family member's former partner was going further than validating the emotions, and trying to justify or prove them right. But this is quibbling over semantics; I think we both agree that challenging someone is sometimes the kindest thing to do.