Should I ask him to stop?

My father in laws brother passed away a couple days ago but he keeps saying his brother passed away so our son can be born. I don't like that he says that I find it rude and disrespectful to my son. That's not how I want my husbands family to remember my son being born being so close to my due date I know if he keeps saying that it will eventually go around and people will start saying that also. Should I tell my husband to talk to him and tell him to stop saying that?