Sharing your dinner
You need to be cautious of the foods you are feeding your cats - foods like chocolate or avocado could be very harmful to them. It's better to feed them the standard cat food instead of risking any future health problems.
Feeding them milk
Cows' milk is too low in lipid and protein and too high in lactose. This isn't the best drink to feed them because most cats are lactose intolerant just like humans. They don't have the proper enzymes to break down the lactose and will end up vomiting or having bad diarrhoea.
Treating them like a child
Cats are very independent animals and don't like to be cuddled to the extreme. If they want your companionship they will come to you otherwise it's best to just let them roam about.
It's normal for pets to damage your nice belongings but punishing them isn't always the best decision especially for cats. To be honest, cats couldn't care less if you are yelling at them.