Let my daughter-in-law's ssiter, bay and baby daddy live in my basement. They have been "leaving" for half a year now. I asked to leave and they said they are not ready and will leave when they are. They enter through my main door into my house to get to the basement. They moved their furniture in when they came here. My options?

Written eviction notice hand delivered starts the process. Keep a copy for further actions in accordance with the local laws. Do they pay rent?

They are not "house guests" they are renters ( they may not pay, there may not be any written agreement) but they are renters and will need to be evicted.

You could invite the Naked fat man to stay in the house... buy pleanty of cheetos.