Yes it is early days and I truly hope that my son is showing his grandad the ropes. They were very close especially when my son was younger. My Dad took it very hard when my son died.
We have had a hand print appear on our bathroom cabnet there are only 3 of us in the house and it was none of us. The heart appearing in your bathroom sounds a lovely gesture from your husband. The word 'help' sounds unexplainable but it very selfless of you to let your husband move on. I am sure they walk beside us always regardless anyway.