This one is for the mum in law

DH is initials for "Darling Hubby", I can't tell you what FW stands for, it's something I took out of Bridget Jones' and would feel awful letting you in on that little secret. I'll just say that it was a temporary nickname when he tested my anger to the highest level, and after a day of contemplating, he has brought that back down and is now known as DH again. You said in your comment that you would prefer FW to DH, but I sincerely hope that isn't the case in talking about your own sweet darling son.