Granddaughter can prepare a bunch of flowers for grandpa's third anniversary, write down her thoughts on grandpa on a card and put them in a civilized memorial service. The third anniversary is a sacrificial ceremony in funeral etiquette, also called "undressing", which occupies an important position in the whole funeral culture, so people in most areas will attach great importance to it. The tributes prepared for the third anniversary mainly include fruits, flowers, steamed bread, sacrificial meat and vegetables, paper money and so on. This answer is for reference only. Don't be blindly superstitious.