The taboo of old people's death and granddaughter's taboo?

Hello, after the death of the old man, granddaughters can't go to the grave within seven days of the old man's head, and they can only go after the first seven days. Granddaughter should bring some food and paper money to the grave, as well as the old people's favorite food before their death. When you get to the grave, you should worship the tomb first, then put down your things and kowtow, and finally pick up something to eat. Don't wear white clothes when sweeping the grave, because white represents grief, and it is better for granddaughter to wear red clothes when sweeping the grave. And don't wear hats, because hats are filial hats, which are for the dead. Also, don't wear sunglasses, because sunglasses are a kind of disaster prevention in Feng Shui. Don't whistle when your granddaughter goes to the grave, or you will attract ghosts. And don't cry, because crying is easy to attract eyes and bring bad luck to the elderly. Don't leave immediately after sweeping the grave. It is better to sit in front of the tomb for a while and talk to the old man, which will help the old man's soul rest in peace.