I've 4 kids, with Extremely big gaps, I done it all on my first, everything, they turned out lazy and dirty, and that's the truth of it.
It's a car crash trying to reign them in when they've hit the teens, because they already have the lazy habits, and now a hormonal, rebelling attitude to go with it.. I feel your pain
You can try and talk, explain how unfair it is, but it doesn't usually last long. The only other option, is set out their jobs/chores, and start removing things like electronics, internet, when they don't get it done. They need the lesson in the harsh realities of life, and that they aren't just entitled to everything.
If you have any more, you need to implement tidying from a young age, it then becomes a natural step to them like walking and talking
I so wish I knew this in my first two, could of saved myself a lot of stress, arguments the lot.
I wish you all the best on making the changes, hugs Mamma bear, you are gonna have to be ready to start standing your ground, and teaching them that their treatment of you and your husband is a level of disrespect that you are no longer putting up with x