Take care of yourself first, that includes giving yourself time to grieve. I am so sorry for your loss. Not in the best place to offer support but lost my bro in July and can relate if you want to talk some.
My condolences, there's no actual advice that can be given in this situation, my friend. Your relatives will have to remain strong, that's all i can say. The loss of a loved one is a scar that never truly heals.