What if a family try to get one of their family members into a psychiatric hospital under false pretences? The person might not be mentally ill, but rather just a nuisance that they all dislike and want to get rid of.

It reminds me of a scene from the sitcom Peep Show where Super Hans and Jez try to get Mark sectioned: https://www.youtube.com/watch?v=r8ngDnWwFBI