My mother who is 70 at times threatens myself or my sisters(we're over 40) with eviction,can she do this with no real cause?

Unless you have an agreement for particular period of time, she can file a dispossessory action upon at least 60 days' prior notice.

If you would like to discuss any issues further, please feel free to contact my office. My contact information is below. Thank you.

The foregoing is general information only, not specific legal advice. No attorney/client relation has been created or should be implied.