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HI - my name is ***** ***** I'll be glad to assist.
Based on what you've posted above, you should have grounds to sue the landlord for harassment and breach of your right to quiet enjoyment of the rental space you are provided. Also, your mother could seek a restraining order against this person based on his harassing phone calls and stop him from contacting her.
You may also have a claim for intentional interference with your business by calling and disrupting you and your employees....
That said, if you pursue a legal claim against your landlord, it likely isn't going to make things more cordial/civil between the two of you.....I'm sure the landlord will take offense and be looking for a reason to evict you.....but as long as you pay your rent and don't give him the opportunity, it should help in the long run.
Also, if the landlord did try to evict you in retaliation for you filing suit to protect and enforce your legal rights, you could sue for retaliatory eviction and seek damages for that as well.
Please let me know if you have any additional questions. Also, please take time to positively rate our conversation so I may receive credit for assisting. Thanks again!