Will we be able to sin in heaven?
I think sin is doing what God has told us not to do, and that is usually something that hurts others for our own gain.
But in Heaven I think we and God will be so united in spirit, that what I want for me is also what is best for you. We will be like one big body where the finger scratches the head when it itches, and is happy to do it, because the finger and the head are considered the same body.
“I pray that you become one as I and the father are one.” John 17:20-23