Hi@john74 I think it's like that for a lot of us with Christmas... memories of happier times. I don't have kids of my own, so I can only imagine the pain that being forced to be separated from them at any time, let alone this time of year would bring. I got to a local men's mental health group, and there's a few guys there in a similar position to you. Having to deal with a narcissistic and controlling ex to have any contact with their kids. I've seen in them how difficult it is and how much damage it can do to the mental health.
I think you're right about it being an impossible problem to resolve. Hopefully your kids will one day see the truth and start some contact of their own with you. Sadly, it's one of those things you really can't control. When I find myself in a mental battle over something outside of my control, I like to try and focus on what I can control. Maybe for you, it might be to remember those happier times as proof you are a good dad and that this current situation isn't you're fault. That control your ex has over you has it's limits. Don't let it make you blame yourself or think less of yourself. There's a lot of problems in the whole system with these breakups and a lot of victims of it. Take care of yourself and hope that things can change with you kids. All you can do is wait and be ready for them if and when that happens. Are there any groups. online or in person, you could go to with other fathers in a similar position. If I recall correctly I think you said you lived in a more remote rural area, so options may be limited. But I know guys in our group get a lot about talking to other guys who understand and remind them that they are good dads, but just victims of a very broken system.