Good afternoon Mike,
I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
I'm afraid that being a caregiver does not require that the park landlord allow you to stay in the park full time. An argument could be made were it just one of you and around the clock intensive care was needed that a live in was necessary and protected by the ADA regulations. Once you start adding additional caregivers, the chances of successfully arguing ADA entitlement diminish.
Mobile home parks may legally charge rent based on the number of occupants in the mobile home and that is a legitimate charge and so if they raise the lot rent, that would almost certainly be fully enforceable. And it would be preferable to being asked to relocate as well.
If by you staying in the park your sister in law is deemed to be violating the lease terms, then the landlord could seek to terminate her space rental based on the rule violation and force her to relocate the mobile home. So that is something to be avoided, and I would suggest that you approach the landlord about adding you and your wife to the lease agreement and deal with the increase in rent as a consequence.
I understand that you may be disappointed by the Answer you received, as it was not particularly favorable to your situation. Had I been able to provide an Answer which might have given you a successful legal outcome, it would have been my pleasure to do so.
If you have additional questions, you may of course reply back to me and I will be happy to continue to assist you further until your questions have been answered to your satisfaction.
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Thank you in advance. I wish you the best in your future,