Can I hang the bell on grandma's key?

You can't use it. Bells are evocative and evil. I suggest you put them away permanently, preferably where you can't see them, otherwise you will still dream about these strange things. In addition, it is unlucky to dream of a deceased relative laughing and laughing. Generally, relatives who dream of death are expressionless or serious, doing their own thing and ignoring others. Usually they can't see their faces and facial features clearly in their dreams. Such dreams are all right. Dreams like yours should be related to the use of bells, because both bells are noisy things, which will make old friends fidget in a sense. So, I remind you in my dream, don't use this ringtone to call again, she needs to rest in peace. I hope I can solve your doubts and put away the bell.