His body has stopped functioning, but that is beside the point.
Does the Book of Revelation show deceased Christians alive?
To imagine saints in heaven interact with humans on earth is a position that leads to all sorts of errors and ultimately keeps men from seeking the only mediator between God and men, Christ Jesus.
It should be enough for us to know our loved ones are happy in the arms of the Lord. Like David, we are comforted by the fact we will see them again. We shouldn't be looking for more.