OK, long story. My child is at Primary School and best friends with a child named Fred (not real name). I became friends with Fred's mum who confided in me as she was a single parent. Fast forward a few years she meets a new man who seemed pleasant enough. One week at drop off I chatted politely to New man. A few days later I get a string of abusive messages from Fred's mum that I've been stirring up gossip and spreading lies between her children's father and new boyfriend?! I obviously denied it as it clearly wasn't true and received even more abuse and name calling. I doubt we will ever speak again and I'm ok with that. Obviously she's deleted me from social media as expected by such people. She blanks me. Trouble is my child is best friends with hers and he is always playing with him. My child wants Fred over. Not going to happen - his mother makes false allegations and I can't take that risk. She won't acknowledge me and I refuse to apologise for something I haven't done. A few weeks later Fred's mum gets called in about her son being a bully. Fred's mum denies it and intimidates another parent for reporting it and sats Fred is the victim. Since meeting this guy 2 years ago she's become nasty. Her or her new boyfriend are clearly unhinged and I'm questioning now all the things she's told me and if they were ever true. She's now starting a new family with new boyfriend. The issue I have is- how do I deal with my child and Fred? I can't explain it to my child why he can't have his best friend round anymore or to parties etc.