Starblaze -- "I was very angry when my mum accused me of using the children as weapons. It was the first time I had ever heard that term. It goes completely against my nature to do anything like that." -- Exactly. A typical abuser 'turn-around'.
As a child abuse victim, after the gas-lighting (which I consider the worst offense abusers do) the projection is right along side. It's the, "I'm not abusive! You are abusive toward ME!" mentality and, "The ugly, dirty, manipulative crap I do? NO. I am not doing 'that'... But YOU are using your children as pawns..." -- which of course is probably what they did/tried to do.
As for my 'family' and handling the local Child Protection Agency all I can say is they vary from country to country and jurisdiction to jurisdiction.
The way We handled ours was, before we had Our first, reported to them that once 'certain people' knew We had an infant in Our care, that 'that' was sure to make Our abusers 'remember' how useless/incompetent We are and just how unsafe/potentially abusive/neglectful We might BE to that child. I find that idea pathetically humorous.
Of course My/Our abusers believe We are going to be 'bad'/abusive/incompetent parents... They internally 'know' THEY were crappy parents and I think 'know' that behavior is passed down.
So Our abusers KNOW We might/could possibly abuse Our children -- Just like THEY did THEIR child(ren). So their 'concern' IS 'justified'. Their dysfunctional thinking comes off the rails at this point -- They think that somehow that makes them 'better' and more qualified to protect/'look after' Our children then We can.
If you failed as a parent/one or more of your AC have gone No Contact and told You that YOU are the 'issue' and are with-holding the grand-children for that 'reason'? I side with the AC every time because no healthy person turns down healthy relations with other 'safe' adults/family. Children are exhausting and the more help/love/support the better.
Sooo... IF some poor EP who offered all kinds of 'help' and baby-sitting and setting up rooms etc. and is rebuffed? There is a 'reason' and it's obviously a "reason" because I remember the first time I felt okay with leaving/trusting my child to someone else's 'care' and in a space they 'set up' for their young house-guests. When You never feel 'at home' in your own home as a child, when someone says, "My home is Your 'home' and this is the space We (as healthy people) offer to You and yours as a 'safe place' to stay at when You want..." We can feel like, "What's the 'catch'?"
Healthy people/thinkers look at Me and say/remind Me -- "Love isn't a transaction. Love is freely given." And I can say back, "Not in my experiences but... I try every day to improve."