If that's what she is supposed to do...then Terry should have stayed home, too 

 It's what he is supposed to do also. Then they would have no money to fight over and we would all be paying for their welfare instead of having this argument. 
 
They obviously had an agreement for 20 years (or whatever). That's the point. She stayed home and he went out to work. 
 
I can tell you this. I do all of the laundry and all of the cooking and cleaning. Is that what I am supposed to do? OR is that an agreement between Dan and I? I wonder how many loads of laundry Terry did. I wonder how many meals he cooked.