I truly believe that there is nothing "going on with grandpa" or anything sinister there. I think that your little one is a little one and grandpa is much bigger and probably has a deeper voice. His hands may be rough from years of work, he could even have a bad breath that the child can't take. Heck, it could be many things, but I don't think there is any foul play at all. My nephew was the cutest thing, I loved him so much and he looked like a doll. We played and I babysat, he got so used to me, when leave was over and I had to go back to the army. It was over a year before I had leave again. when I went near him, he cryed like I was the wool of the worst! This hurt me, but I had not been a constant in his life, and he was unsure.
Don't try to press it. Grandpa is wise and he is not hurt by this, it has happened to him many times in the past or he has seen it. Your son will soon notice that this nice gentleman likes to play. He will come around in his own time. so, allow him to do that.
Don't start seeing grandpa as any type of person doing anything wrong to your children. Don't listen to those types who suggest that. If anything was going on, you are an observative,conscientious mother, you would notice and see physical signs. Your instincts and discernment would tell you. You would know.
Some kids do this, and it is alright. Just comfort and reassure him. Pat grandpa on the shoulder, and hug him infront of the kids for thanks and praise. Your little one will see your trust and he will eventually begin to trust too.
GRANDPA IS DOING NOTHING WRONG. YOU ARE DOING EVERYTHING RIGHT TO ASK OTHERS IN THIS FORUM WHERE NO FAMILY MEMBERS WILL START RUMORS OR REACT IN THE ADVERSE.
You are doing okay by me kid and so is grandpa. Damn! I wish my kids had had a grandpa like that on either side of the family.
J.