So very sorry for your loss. We lost our 16 month old grandson three years ago. The personal loss you feel is devastating, and having to watch and guide your child through this is overwhelming. Lean on each other, lean on your church family if you have one. Your true and faithful friends will be there for you. Anger is part of grieving and the rage will come. Let it, but let the fact you got to spend 4 months with a pretty cool little guy wash that anger away. Grandkids are a gift. He will ALWAYS be with you, and you will always be with him. God bless and watch over all of you.