What do I do? Advice plsss

Hello! I need advice and I'm venting!!! 😭
So I have this neighbors that just come to our house unannounced use our wifi and electricity and when we are not home they go to our house we are aware but my parents let it slide they even broke some of our things and didn't even say sorry my blood absolutely boils when I see them but we see each other everyday since they use our wifi and just comes inside our house with no warning and sits in the sofa like it's there house!!! By the way they don't pay ever or help our family my parents are just overly generous and they took advantage.