In my experience, dickheads like this tend to stick together as they’re the only ones who wouldn’t call each other out on their poor behaviour.
@Mumof22025 - I hope you get a chance to switch off and chill out on your holiday. Fully agree with all the previous posters, that his behaviour would have me seriously questioning the relationship. He’s being a twat, pure and simple, but he’s somehow convinced you that his effort at work beats yours at home and therefore his need to relax is greater.
Leave him to handle two grouchy kids all day, go and explore (or hole up with a book in a cafe somewhere) and when he complains in the evening, just say that you deal with that all the time. You’ll happily swap roles with him if he thinks full-time parenting is somehow easier than work.
Growing up where I did in Cheshire, I’ve known a lot of men like this - my dad used to come home, laughing about how the other partners in his firm were hiding money offshore from their wives from the inevitable divorce settlements and the like. I never could get angry about it but it did force me to get smart, which has stood me in good stead.
Look after yourself because by the time he’s on compliant wife number 2 or 3, you’ll be the one picking up the pieces for your family with no recent job history, transferable skills, pension contributions or the ability to afford a decent lawyer against his top class one (probs recommended to him by his prince of a best mate 🙃).
Edited a typo.