<human>: My brother-in-law moved in with my husband, father-in-law, and myself. He brought his cats that had babies. My husband and I kept 2 of the babies and we already had 2. We now have 6 cats in our house. My husband and I work full time while bil stays home and plays wow. Fil drives semi and is only here on the weekends. 

Obviously, bil spends more time with the cats. One of them, Master Chief, has a weird obsession with trying to eat plastic. We discourage it as much as possible and try to keep plastic away from him. However, bil isn't as careful about it. 

I don't know when but apparently MC found some. After yelling at MC to stop a few times bil said he threw a shoe at him! 

I made it very clear that it was not OK. I told him not to do it and tried to explain why I had a problem with it. He honestly could not understand why. I asked him if he would do that to the baby once it gets here (I'm 5 months along) and he looked shocked and said no. He couldn't or wouldn't tell me how it was different. 

I am so scared to leave my cats alone with him now. I can't lock them in my bedroom all day or they will tear up the floor. I don't know what else he will do or has done.

Can you provide a brief overview of the text?
<bot>: Brother-in-law decided throwing a shoe at my cat was the best way to stop it from eating plastic. I told him that is not OK but now I don't know what to do.