QueenJulian
So sorry you have been cut out of your GC life, me too, 3.5yrs now and like you, I did nothing to deserve it, quite the contrary, I was very good to them both. Cut out by my s.i.l & hate to say, my [brainwashed] D. They live just 5mins down the road. I had a very special bond with my precious GD, as my D&GD lived with me before nasty s.i.l came along. I chose my GD name with my D, [father not in the picture] she was then named after me, my first & second names are GD's middle and last, but nasty s.i.l [GD stepdad} took away her name! and re-named her after his GM, no relation to my GD.
I had no problem with him, but he and his mother were jealous of my strong & special bond with my D&GD, so I was cut out along with everyone else in my D birth family! I went to court, bad decision, made it all a thousand times worse! I didn't win. So I wouldn't advise that road.
Myself and others in the same sad boat are on a thread in 'relationships; Support for GP cut out...' It's been going for years, I've been on for over 3years now. You should go on and get the support and advise there.
How long is it that you last saw your GC? You don't have to have done anything to be cut out, it is usually down to jealousy of your AC spouse. [adult child]
God Bless 