Katie59
I would bet your ex said something horrible about you and eldest daughter took your side, it only takes one word, or something taken the wrong way to cause a lifelong rift.
Don’t stress yourself about it, you have a good relationship with all the children now they are adults.
This is very common you are not alone with this sort of rift.
I think Katie59 and BlueBelle sum it up well.
The best thing you can do is find a way to put him and this conversation out of your mind.
Your daughter is blessed to have him out of her life.
Anyone who can treat someone, let a lone a family member in this way doesnt deserve your heartache.
BTW I think you have done a great job with all of your children, given the challenging circumstances you have all lived through. Well Done.