No, it does not have to be notarized.

How do we get someone out of a home we own where she lived with our son and now the relationship is disolved.

Presuming this is your house, you would start an eviction action to terminate her license. She is not a tenant (unless she is, in fact, paying...

Is a company allowed to set my end date after I give my two-week notice?

It depends on when and how your PTO accrues. It sounds like payment is owed to you. You can file an unpaid wages claim at the NY Dept. of Labor...

Can I sue a private seller for a car I purchased from them that turned out to have a bad motor?

Unfortunately for you, you only recourse, depending on what exactly was "inspected", is to sue the inspector of the vehicle. You have no recourse...

What types of licensing would one need to provide a designated driving service?

You are providing basically a livery service which will require whatever your local regulations are regarding providing livery service. You will...

How likely is it that a creditor with a default judgment against an individual will seize funds in their LLC's bank account?

Any asset owned by your husband, including an LLC and its assets, are subject to seizure under several theories. For specifics you will need to...

You can commence legal action claiming breach of the agreement (the agreement is a "contract" and the violation is a breach of that contract).

NY Deed requirement?

Unless your sister was on the original deed, you may need to re-open the estate, transfer by deed out of the estate to your sister, then transfer...

Can an employer reduce my salary ?

Absent an employment contract or discrimination of some kind (age/race/sex/etc) yes, in NY, employment is "at will" and you can be terminated or...

Is it our responsibility to replace the water tank or the landlord?

The responsibility will be set forth in the lease. It would be a "usual" case, in a commercial lease, that the tenant be responsible for items...