Here's the thing - any time you deviate from the parenting plan - it's on you for saying yes. After it didn't work out once, any subsequent times you say yes, and there is flaking...you enabled it and you pretty much might want to kick HIS ass....but throw your foot back and hit your own in the process.
It's self inflicted "BS". Stop allowing (or agreeing to) deviances from your plan.
If he doesn't show up or take his visiation when it is scheduled for him to take, and it is a consistent problem, you can take it to court (as long as you are documenting it and prove it) and have his time reduced.
Anytime you deviate from the plan, and it doesn't work out - you can't use that in court. So write him a certified letter stating that from x date forward, there will be no deviating from the parenting plan (that goes both ways) and you will be documenting any time he does not utilize and will have his parenting time reduced by the court if he does not take his children when he is supposed to.
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