If this is true, Peaty’s mum is doing a grand job of solidifying this rift by replying to and getting validation from people like this. The only person she should be seeking to speak to is her son, to try and resolve whatever has gone on.
I said on a previous thread about when kids go no-contact with their parents: there could be a million reasons a (n adult child) may be angry with or want to cut off their parents. The parents may not agree with those reasons, or they may remember things differently, which happens. That’s life. What’s important is how they react to their (adult) child’s distress and complaints. If they are open, empathetic and communicate with maturity and understanding, genuinely apologetic for their part in it, then a resolution will be had and the relationship will move on stronger.
If they react with hitting back, getting other people to attack, posting passive aggressive nonsense and acting like they’re a hard done by victim, well…you’ll only seek to alienate your kids further.
Mrs Peaty, whatever has gone on, one of your children is hurt by your actions. Stop lashing out and maybe try and listen to them. However I fear it might be too late now after the circus of the last few days.