Hi Jen:
No invasion. But I'm not sure that I can help much. Both my husband and I are heavy and so we're just pretty tolerant of each other and don't say much.
However, my best friend's husband (she is small like you, he's large) always talks the "oh whoa is me, I can move, I can't get a job, I know my weight keeps me back". etc.
I guess I figure if he's will to talk about it, that he might be willing to do something about it, but........... he won't. No matter what I say to him, he won't try Oxycise, which is breathing exercises that you can even do sitting in your chair.
I know I'm rambling here and not helping much, but the bottom line is "you can't want it more for him than he wants it for himself." It's sad, but that statement is very true.
Does he work outside the home? Do you? My first (and probably only) suggestion would be for you to prepare food that is healthier. Cooking at home is probably one of the first and best things you can do for healthy eating.
I'm married, as I said, and I have two grown sons (23 & 25) who are still at home. When I cook right, they eat right. There's nothing I can do with the hours that they are out of the house, but when they're here for dinner or on the weekends I can pretty much control what they eat. And when I'm following MY program, they will lose too.
A couple of tips. Only cook as much as will feed your family for that meal. NO leftovers, because leftovers don't tend to be saved, they tend to be eaten.
"Plate" your meals. Leave food on the stove and put portions on plates and serve your family. Don't use serving bowls.
Make sure that you don't bring any "junk" into the house. Your kids will benefit from the decisions you both make. Buy healthy snacks that, even if they decide to have more than one, will be condusive to a better way of living.
Try to get him to up his fruits and vegetables intake. Even if he's not a real fan of vegetables, there are plenty of ways to "sneak" them in.
If you have made a huge pot of something where you will have leftovers put the extra portions away right away, before you sit down to eat.
Hope that helps some. Best wishes to you and your family. Your husband is very lucky to have a wife so willing to support him.