If your wife is taking the children abroad she will be breaking UK law if she does so without your written consent- it’s a criminal offence. I had to send my wife’s solicitor my written permission, which initially I was reluctant to agree to as the holiday was meant to be for us as a family. I realised that it would affect the kids if they didn’t go. So much as I wanted to say “no” from an emotional perspective, I let it go.
Me:48 W:43, Kids:S19, S17, S10, S8 M:10 years BD:06-18-2018