to insist, to the point where his dad gets angry at you in fornt of him, on having the address (a fact that your ds can easily supply to you once they get there) is irresponsible, if you ask me.
it is not a necessary piece of information for you to have, at the point of departure.
we are clearly not going to agree on this.
but I know that I would not be insisting on the informaiton you have been if my dsd ws going away (and have not done so; neither has her dad. her mum has, on occasion, but more to be awkward than anythign else - it cause high stress to dsd, and onceher mum stopped asking the awkward questions, dsd's anxiety reduced hugely)
obviously no 2 childrne are the same.
if your ds has a range of coping mechanis,s, then the address is even less important, tbh. I fail to see why you need to know it before they even leave.
you have his mobile number, and presumably your ex's. your ds is able to find out information as necessary (outwith a meltdown situation), so why cause all the stress in the first place?
you knew oyur ex woudl be awkward abotu ti - he has been before. why put his back up (he will not be as tolerant of your ds' neds, as he is already irritated by them), you will not relax - your ds will be a bit anxious a he knows you are upset - what was the point?