I'm sorry to hear about your Grandma and Grandpa. I know it's hard right now my family in Christ but just remember that this is all temporary. They are now where we all long to go and that is at home with the Lord. The truth is, sometimes God gives us more than we can handle but He never gives us more than He can handle so look to Him for strength and comfort as He is the source of all strength and comfort. Right now your Grandparents are living their best life with Jesus and one day when it's your time, you will be with them too.
God bless you and know that I'm praying for you and your family for peace and comfort.