I'm sorry for your wife and yourself.MrsWx's grandfather has been placed in hopsice, we don't think he will make it through the weekend. Looked up our bereavement policy and was honestly not expecting to get anytime off for a grandfather in-law but I do. Stupidly IMO it is the same amount of time (3 days) as any other relative including spouse, child, parent.
If you haven't had a relative that's been through hospice before, they really are terrific at keeping things comfortable for the person and the family.