John squeezed Sherlock's hand and then looked at his son. "You are. Dad and I don't know if it's going to be a boy or girl yet. But we know you'll be a good big brother either way."

He then looked at his mate and kissed his cheek. He looked positively gobsmacked. It was adorable. So he took a picture and sent it to his mother and father-in-law? He couldn't think of Mycroft as Sherlock's brother.