We are the delighted parents of a beautiful 20 day old boy. 
We've been asking any visitors who smoke to wear a top they haven't yet smoked in to hold him, so bringing a clean top to change in to where necessary. So far no-no-one has had a problem with this.
DP mentioned this to his dad yesterday when talking about his visit today. DPs dad pulled out of the visit as a result. We've tried to tell him it's not personal or judging of us - it is purely health based. He hasn't replied and hasn't turned up. I am surprised he has chosen to not meet his first grandchild because of this.
Is our request unreasonable?
I am trying to not like my dislike of him cloud my feelings on this.