Informing boss

Well I believed a boss who is managing a team consisting of male and female staff should be able to understand this kind of situation (even more if he is a Husband or father himself). Well at the end of the day, sooner or later, you will have to tell him. Better to inform him earlier so that they can plan the work around. Who knows they may be happy for you and also help you through. You can just send him an informal text or pull him aside to the pantry and talk to him. Cheers