landlord harrassment non tenant

My son put my name down on his rental application for emergeny contact. His landlady is an attorney and each time he does not pay his rent or they have a dispute she calls my cellphone leaving all kinds of messages. I did not sign anything and do not owe this woman anything. I asked her once to stop calling me. She asked don't I care about my grandchildren. Your son is not paying his rent. She also said you live in an apartment complex why don't you help your son pay me/

HOW DO I GET HER TO STOP. SHE IS HARRASSING ME AND I AM NOT EVEN HER TENANT?
What do I do short of telling her where she can go? I am sure she will retaliate on my son is I curse her out