What about if your neighbors are a gay couple who adopted two Christian boys and dressed them as girls. They also sublet to a group transvestites who go door to door to sell women's underwear and lipstick. One time you saw your gay neighbors make out right in front of your house. They also burned bunch of bibles in their backyard (they called the fire department to warn them about the yard garbage fire).
Your son goes to the same school as the two boys and fell in love with one of them. He told you that he will marry one of them.
They also have a nice statue of Jesus sitting on a massive cock made out of wood surrounded by the village people Apostles in their backyard.
Your other neighbor is a swinger couple who host swinger's parties in their backyard. They keep inviting you to their parties to bang some hot 20 year olds with massive boobs but you keep refusing, you dream about it, but instead you go and read the bible with your wife.
1. What does the Bible say how to deal with your neighbors?
2. What would the people in the ancient Israel do to your neighbors after reading the Bible?
All of those activities are now totally legal. Your scenario sadly becoming less far fetched by the day. The Bible says those things are wrong and sinful severe crimes which should be outlawed. The Bible, however, does not promote vigilante justice.
In situations such as this it offers clear guidence. Move away, enroll your child in private school or home school and let your neighbors deal with the fallout of their own choices. See the story of Sodom and Gomorrah.
Biblical law does not promote vigilante justice. In ancient Israel the those suspected of capital crimes would be arrested and their would be a trial with strict standards of evidence including multiple eyewitness required for conviction.