Periods

My son in law and daughter have 4 girls and last spring she explained to her 10 old daughter the process of a woman's body and menses. The seven year old didn't want to be left out wanted to hear it too. So she told them what they needed to know.
Later that week while trying to explain to his 10 year old daughter the difference between an exclamation point and a period. The seven year old piped up and to his horror. Said, "NO dad that is not what a period is at all". "Don't you know, it is when a woman has a menses and that is how you and mom got babies". She proceeded to explain to him in perfect word for word detail the reproductive process of the woman's body. With that my son in law threw his hands in the air and said, "I am surrounded by 5 females, I give up".