Did you never talk to your father about yours even asking him to get you chocolate or pads? Does your husband shy away from the topic?
My husband will often pick up pads or chocolate for out girls. He has a general idea of when they are due to start (we don't really "track" them but they are around the same time every month) sometimes when we are out shopping as a family he will ask the girls "how are you on pads? Do we need to get more?" It's not a big deal in our house, sometimes he will know they started before me because they call him and ask him to get chocolate or something salty on his way home from work.