My three kids range in age from 13 to 16. The only "material change of circumstances" was their decision to go live where the living was "free and easy!" Can anyone blame them?!?! From our house they walk to school, from their mother (who lives out of school district) they get a drive. At our house we focus on wholesome healthy homemade meals, at their mother fast food accounts for at least a 1/3 of all food consumed. At our house there are limits put on electronics times, at their mother the phone goes to bed with them and I have had texts from my oldest after midnight on a school night.
I have 9 letters of reference from friends and family who are completely gob-smacked by what has happened in our family and how the kids have basically abandoned us!
After being on this forum for a while, I think many of the posters you believe are being negative of picking your situation apart are simply trying to give you a REALITY CHECK before you jump into very expensive (and futile) family court litigation to try and restore the 50/50 parenting agreement.
I am quite a bit younger than most of the posters on here and not that much older than your kids. My parent split up when I was 10 so I know exactly how living in two households with two set of rules works and feels.
I too chose to live full-time with the permissive parent (my dad) in my late teens. My mom had sole custody and primary residence up until that point, so my moving out cut her income drastically, she was laid off her job shortly after that and was forced to sell a house she could no longer afford and also look for a new career.
DID I CARE?? KIND OF, BUT NOT REALLY!!
I am now much more aware of how painful and disruptive my decision was to my mom's life and realize it was probably not really in my best interest since I was then able to to stay out too late (not come home at all), eat junk food, drink with my friends and smoke pot, all with little to no consequences.
Had my mom acted as hurt and angry as you seem to be over that decision, I would have avoided her pretty much the way your kids are keeping their distance from you right now.
Your kids know full well that going to live with their mom has hurt your feelings and upended your life as you knew it.
I'm pretty sure part of your kids avoidance of you is so they don't have to face up in person to the hurt they have caused their you and your spouse who have tried so hard to do the right thing.
You said yourself, you would have done the same at their age, given the choice.
You need to QUIT trying to prove to your kids, the court, your friends/family, etc, that you are the better parent!! Your kids know it, their mom knows it, the court would maybe see it in a couple of years of litigation if you kept fighting that long, but it DOESN"T MATTER!!
Honestly, who cares how many letters of reference you have!!
If I was still a self-centred teen and in this situation, that statement would literally make me laugh at you and make me fight harder to screw you over.
The more you spin your wheels and blow this situation up, the further the kids will run from you and the harder it will be for them to reconnect afterwards.
You might take offense at this suggestion but IMHO, you need to get some therapy or counselling to calm down and get your head on straight before you self-destruct in court, which will cost you $$$$$ and leave you even angrier.
Have faith that you have been a good parent and that a lot of what you taught your kids over the years has stuck in their brains and your efforts to provide them with a healthy, structured home will be appreciated down the road.
They will realize their mother chose to be an indulgent "buddy" parent someday and they won't respect her for it in the end.