I like this one
Richard in Boston calls his son in London the week before Christmas and tells him, 'I am sorry to tell you but your mother and I are going to divorcing. I just cannot take any more of her moaning. We can't stand the sight of each other any more.' I am telling you first, Richard, because you are the eldest, please tell your sister.
When Richard calls his sister Jennifer, she says: 'No way are they getting divorced, I'll go over and see them for Christmas.'
Jennifer phones her parents and tells them both 'You must NOT get divorced. Promise you won't do anything until I get over there. I'm calling Richard, and we'll both be there with you tomorrow. Until then, don't take any action, please listen to me', and hangs up.
The father puts down the phone and turns to his wife and says. 'Good news' he says, 'Richard and Jennifer are coming to see us at Christmas and unlike last year, they are each paying their own way.'