So much we don’t know, but it doesn’t stop people having strong opinions. I wonder whether the OP and DH are managing within their income; or eating into their savings. And if so, is this in a managed way? Obviously, they need to sit down and have a proper conversation about their budget, but I think OP has realised this and I do wish them well. Squabbling about money is miserable.
I’m surprised at people in their early 70s saying things like ‘ you can’t take it with you’. True of course - but my DM is still enjoying life at 92….. so your money might need to last you quite a long time. None of us know how long we’ve got - but it might be longer than you think!
I am pleased that DD was careful with money and DM has savings. She never has to worry about putting the heating on or paying any of her household bills. She’s able to replace things that wear out, and can still have a regular haircut. Whenever we challenged DH about their savings and his unwillingness to spend money, he always said that he wanted to leave her well provided for. He said that what she did with the money after he was gone up would be up to her.
So she has done some things in the house that were long overdue (redecorating, new curtains etc) and is happy and grateful to him now. She bought two new nighties and a lovely cosy dressing gown in the SeaSalt sale and it’s lovely to see her still enjoying such a good quality of life, with no real money worries.