I apologize for being so long in getting back to you. Your circumstances, sadly, are not unusual. Even in the best of circumstances, when someone new comes into a family there are adjustments. However, if someone is unstable and spreading rumors and/or lies this will create tremendous havoc. I would encourage you to not take sides as best you can and to try and encourage your relatives to get counseling, or go to a mediator if that is an option. You might also try and talk to your Granddad if he is open to listening to you. If he does, it is important that you only talk about how everyone in the family is so upset and not cast blame on his new wife. He will most likely only become angry if you attack her. Try to enlist his help to bring healing to the family.
Good luck, Celest.
Sincerely,
Bob