Just returned to thread so this was the first post I have read- I will read the rest after posting.
@yardandbard Op mostly replied to all my direct questions. Thank you OP. This is now sufficient info. What I would say is that, your DH (sorry I thought it was DP- as you are married, you have an equal say); so your DH must not be wet and let him be dictated by the ex. So EACH year, say 1st February after Christmas spending, your DH should contact Ex and announce: [THIS Year he is contributing £1000 each to the kids' vacation with the ex. So Ex should please try to choose holidays that fit the amounts. END OF.]
[Me (DH) and OP and all the kids are also going to stick to our yearly, and equally restricted vacation spend, this year.]
Lesson to anyone: If you let other people dictate your life for you, of course you will be made a fool of. It is one great quality my parents taught me to respect myself, respect my time and set boundaries. Everyone around me knows my limits because I make that clear, in a loving way.
For instance, another good tip I got from mum is that when helping others financially ( I am generous), I should never give too much. I was talking to a nephew needing a new phone- I could afford it (making some adjustment as I just had a huge spend when I discovered his phone was old), but I made him wait a bit. 1) They realise that your help is valuable and not to be taken for granted. 2) They learn to look after their things. SO after waiting for a year- I had to pay for their x-mas food etc too, he is now getting his new phone. In teh past, I would have gone straight in to give it straight away. My mother has taught me a good lesson, which is also helping me and help me not expose myself through my own generosity.
Today, he contacted me about moving into my flat which is being rented out: Again, as phone money is not yet given, I simply asked if he wanted me to divert the phone budget to his transport costs as flat has a long term tenant ( he has room at his uncle but thought my flat would mean less transport costs, but that's also wrong as it is equally far from where he needs to go. However, I was chuffed that instead of being seen as saying no, I had his phone budget to divert. Of course he wants his new phone. Of course he himself needs to make other cuts to afford his transport costs. Of course, he also managed to see, I use the rent to support him and the extended family- so when tenant delayed payment for a few weeks impacting his phone money, I let the nephew know why I was making him wait further. So take these people on a journey with you. The last tip came from the mother of my God Daughter- to tell people I also don't have money. Human beings will take, take if you let them. Who wouldn't want yearly holidays without a budget? Who wouldn't?!?