There is no such statute in Missouri.

An attorney would need to review your written agreement with the original landlord.

A residential purchase is such a large transaction that it's generally worth paying an attorney to review the contract and give informed advise.

I suggest hiring an attorney to draft and serve a notice to vacate and then to sue for unlawful detainer.

Unless you are a licensed attorney you may not represent the class.

An attorney would need to read your contract to give good advice. I’m don’t believe an attorney can tell you whether a third party will sue you.

A tenant's health situation does not prevent a landlord for filing suit over unpaid rent. Hopefully, you can find a way to get your landlord made...

Your written lease controls. Does it provide for late fees? Is there a grace period of more than 2 days?

If you have a land lease then the written terms control.

The answer depends on the result you desire and your relationship with your neighbor.