Mama cat & kitten

This is a small tiny little kitten only 3 weeks old! she gets abused by her mom cat abt almost everyday....most of the time u js hear alot of meowing from them both from mom cat yelling and the kitten crying. the kitten is named Navy the mom cat is named Lily. btw Lily (mom cat) is your cat she js had Navy so ye! this morning u woke up and sat on the couch. u again see Navy getting yelled at and hit by her mom cat...what will u do??