Asking Eric: Despite many conversations, arguments my son refuses to move his family out of my home

A parent is currently trapped in an unplanned retirement situation because their adult son and his family refuse to vacate the home. Despite numerous conversations and arguments, the child remains, effectively holding the parent hostage in their own residence. The parent desires to move on with their life and achieve peace. Once the family finally moves out, the house can be sold, allowing the frustrated parent to officially enter retirement as originally intended.