My Biological Father Is Trying To Send Me A Cease And Desist

Location: NY and MT

Background: My “father” has been out of my life for about 7 years now. We left off on non-speaking terms when a 16 year old girl came up to me when I was 20 and accused my dad of impregnating her. I believe her, and the paternity test came back that the baby was in fact his. He never got charged for it. About 2 years ago my grandmother on that side began harassing me, saying I was a bad daughter for not being there for my father when he was going through the death of his dad (another pedophile). In response to the harassment, I put out one final facebook post of a voice recording he had sent to me calling me disgusting and horrible things. I had said if anyone was horrible it was a pedophile, racist, mysognist piece of garbage I knew he was and said I hope the other people in his life see his true colors soon. Present day, he is blowing up my moms phone demanding my address to serve me papers. He has no lawyer, and no oficcial legal document just some hand written nonsense he scribbled up. He has also began to harass me on my other social media, creating fake accounts and demanding my address on things like snapchat and discord.

My main wuestion are:

1. Do I have to take down the post because I said he was a pedophile?

2. Do I have to give him my address even though it’s public knowledge if he were to just search up my name.

3. Can I sue him for harrassment if he continues to make fake accounts to threaten me.

4. Does his threat hold any weight without a notary and without anything official in place?