Save the kittens! 😨😰

Today I went to my boyfriends house and I noticed a stray cat had a few kittens in the yard next door. They were adorable. Well you can imagine my anger when I find out my boyfriends grandma and mom had put out rat poison to kill them. Their reasoning is that they are just strays anyway. What the actual fuck? I'm so disgusted and pissed off 😡 what should I do I don't want to let these heartless bitches kill those babies or any animal 😡
Edit: thanks guys I knew what they were doing was wrong. My boyfriend was saying I was over reacting but I plan on calling our local shelter in the morning.Â