Sorry you lost your mother. Your grandfather did some nice work and as it is almost 50 years old, I would not refinish it. This could be treasure in the future, worth more with the dents and scratches.
BTW, most wood can be brought back with water, but the finish has to be off. Take a peice of wood and strick the corner with a hammer, soak that corner with a wet rag and then hammer the flat surfaces (sides) until the corner regains it's shape, when dry it will stick out a little so it can be sanded to the original size.