I think my hubby doesn't like my cooking!

That is really nice of him :) I would be behoush after eating your food JUST KIDDING! lol

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When he eats my MIL's food, his happiness seems genuine.
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Hareem, its hard to explain but everyone develops a liking to their moms food, especially sons. Even if you were a better cook than your MIL (which I doubt, AGAIN JUST KIDDING lol) he might still prefer his mom's food. I am sure over the years it'll change. You are being considerate to him and that's good, and he compliments your cooking so all is good! Smooth boat ride, I'd say.