I am in a similar position. After lockdowns and demanding job and WFH I am now between overweight and obese. Have been for a while but now doing something about it.
I have an end goal. There is a holiday planned later in the year which requires wearing a swimsuit and none of mine fit. In fact most of my clothes are a bit tight now. I like some outdoor sports but I struggle now as my fitness is not what it was. I am on a 12 week mission to try and get back on track, I find it helps if there is a timescale involved.
So I have broken it down. You cannot out train a bad diet so I have overhauled what I eat. I do not buy snacks, if I do I eat them. I looked at portions and been really strict on that, i just use what is recommended on the packet. Avoid ing processed food as well. I am not touching wine or beer for the next 12 weeks, and bread and buttered toast is out the door as well (a weakness of mine). I do not calorie count.
I have joined a gym (& acquire a PT for the 12 weeks) and got a schedule in place. Classes help as once you are signed up there is a time and a place to be. Once you get going, you go to the gym in between to be better at the classes.
I weigh myself each morning at the same time and write it down in my diary so I can see progress (or lack of). It is a constant reminder of what I have achieved.
The key to all this is why I am doing it. Fed up of being the fat one in photos and clothes not fitting, I have the motivation. Weighing myself each morning is a reminder.
I hope this helps but your DH is the only one who can do this. He needs the reason to drive him to change and once that is there, the rest can be put in place. If you have a holiday with the kids planned would that help or an event you will be going to?