My mother has moved to another state. My children want to go visit her. I currently have full custody of my kids and my divorce decree only states "either parent can go on vacation as long as they notify the other parent". It doesn't state anything else pertaining to this matter. At the time the decree was signed, my kids mother and I had joint physical and joint legal custody. Sense then, the decree has been modified to such time that I will have full custody. Their mother won't let them go out of state and claims I have to get her permission to take them out of state. Our decree does not mention anything about her giving me permission. The issue is, I want to send a child or two at a time to visit but they would be sent with a family member of mine as I can't miss work. My question is, can she stop me from sending my kids to visit their grandmother in another state? This women is and always has been controlling to a sense. If she doesn't have all the power, she plays very dirty and it always ends up hurting the kids. She simply me to send my kids to see their grandmother as it comes down to control...

Based on the wording, no you do not have to get permission, except if your plans for travel interfere with her visitation rights.

Notification and permission are not the same. I would advise to make sure you don't interfere with her visitation time(s) because that would mean you were in contempt of the visitation order. But unless they are going to be in some sort of danger (and I don't think you would send them if they were) I don't see why they can't go.

Agree, you merely tell her when they are going and where, based on what you said, and most custody agreement, this is not moving, I will assume it is for no more than a few weeks,

You personally can travel outside state with them anytime you want, Just not move out of state.

Stop listening to your ex, if you need, consiult a local attorney.