yes i have a cat , i tried and then some of my friend send me a message ;

He said “start by decreasing how much you give her every time you feed her. so, keep feeding her the same # of times each day (should be no more than once or twice), but cut the amount by 25% then 50%, etc.
when you’re not feeding her, remove the food dish out of site. it’s a big no to have a food dish with even dry food in there all the time.And do other stuff to occupy her time - like play with her. tell your Dad to stop giving her food to quiet her. it’s not the answer.”
And now my cat is thin ;)