I assign chores to everyone and if they don't do it it doesn't get done. I am not a servant in my own home. I deserve respect and to be treated like I am someone special.
I think your son is old enough to be doing dishes, laundry, washing and drying, all sorts of other things. Hubby knows he should be doing more.
Tell them you would like to have a family meeting to discuss chores.
You might take each job you can think of, like mowing, washing the gutters, dishes after each meal, cleaning out the vehicles, washing walls, menu planning, cooking, shopping, laundry, taking the curtains down, washing them, ironing them, rehanging them, each and every job you can think of.
Take the ones that are daily then the ones that are weekly, ones that are monthly, every 6 months, then yearly like the gutters. So many jobs. The purpose of this is to have a visual representation of the work you do. So make sure it looks like a LOT of work. They may feel some guilt that they aren't already helping.
Tell them you have decided you need them to help. Tell them they can pick one slip of paper out of each jar, that each of you will be doing this until all the papers are gone. That if they do not do their job it will not be done.