Keep a diary of what you and the children do and eat, and what he does and eats, so last night, eg:
Children: rice and peas; milk
Me: bread and butter; tea
MrCuntyWankerTakeawayChops: fillet steak, chips, asparagus; Very Expensive Wine
And so on. Take photos if you like. You can say it's "all the better to remember you with when you go back"; he might even think you're likely to miss him.....