My heart goes out to any GP who is CO (cut off) from their GC, for whatever reason except abuse (and I trust that's not the case here). I have to agree with absent, though, that we GPs don't have any more rights over other people's/our children's children than anyone else does. I agree, too, with aggie, that if parents are forced to let their kids see their GPs, it will probably just cause more resentment and anger.
Some GPs wouldn't care, I know. They've given up on their AC (adult children) and CIL (children-in-law) and just want to see their GC. But if the parents are resentful, any little thing could set them off and they might just ignore the court order. I've heard of that happening even now and the courts don't/can't do much to enforce the order. Maybe it would be different with a definite law, but I don't know. So much better, IMO, to try to fix the relationship with the parents (I know that's not possible in some cases).
But absent, I'm not sure what "responsibilities" we have as GPs, except to be nice, decent, reasonable people, as in any situation. It's not our job to babysit, even though some young parents think it is. (I do lots of babysitting and love it but not every GP can/does.) It's not our job to help our AC or GC out financially either though I know many GPs do if necessary. Most of us are "there" for our AC and GC if they need help cuz we love them so very much, not cuz of any responsibility.
Anyhow, Maniac, jainesworth is right, the petition you linked us to is about parental alienation, not GP alienation. Nor is it specific enough. I don't know you're situation, but judging by jaines' comments, I assume it's a painful one. And I'm so sorry about that. I just don't think this petition will help.
As for the petition you linked, Shadow, I'm sorry but I don't think it's specific enough either. It's definitely about GPs, but it doesn't say exactly what's being asked or whether or not there would be exceptions for GPs who have been abusive in any way. Is it simply about GPs getting to see their GC, which could be covered by a couple of invitations to school plays and so forth? Is it about visits, in general, or getting alone-time? Does it include overnight or longer visits for GPs who live farther away? Or maybe for all GPs? How about if GPs badmouth the parents while the GC are with them? Is that ok or do they then forfeit their visitation? My point is there are so many ins and outs here that aren't covered. If you've been CO from your GC (you didn't say), I'm so very sorry. But, sad to say, I don't think this petition will help very much.