Birthday images for father in law. Wish your daddy-in-law a happy birthday and read out the beautiful birthday greeting that you wrote for him in front of your family with a short speech . Make him feel lucky to have a son-in-law or daughter-in-law like you by gathering your family and cheering for him on his birthday. Wish your daddy-in-law a happy birthday and read out the beautiful birthday greeting that you wrote for him in front of your family with a short speech. Say something funny, tell him how his grandkids are lucky to have him as their grandpa and praise the old man for raising such wonderful children to whom you are married.