Is this just a simple matter of drawing up legal documents with a solicitor even if there are still living relatives? How would social services know about such arrangements if there were to be, say, a car accident in which both parents were killed but children weren't (say they were at school for example)?
Neither set of grandparents would be able to take on our DS (on one side there is a grandmother with dementia and a grandfather who cares for her; on the other there is a grandmother who is disabled and wouldn't cope with a young child, and a grandfather who is estranged from the family and barely able to keep the council out of his life due to the state in which he keeps his home). So - we have a good friend who lives round the corner, and is basically like family. She also needs someone for her kids so we were thinking of each naming the other as guardians for our children.