This question already has an answer here:
- Is there a third Holmes sibling? 3 answers
Thanks to Oliver for the correct wording. I played back the stream more than once but didn't get it right. As for failing to follow the rules about comments, while I understand the need for courtesy & procedures in online forums, the rules of Stack Exchange make me feel as if I am in a Medieval court of law, and will never manage to figure out which writ I should plead.
So I will bow out, wishing you all well, with apologies for my unseemly behavior.
In the question "Is there a third Holmes sibling?" the questioner mentions a comment Mycroft made, saying "I'm not given to brotherly love,..." Later in the episode, when Holmes is saying good bye to John beside the airplane, Sherlock says that his brother and sister used to sing a song about the wind to him.
The comments made by Mycroft and Sherlock suggest that the series writers have a Holmes sister in mind. It'll be interesting if she shows up in the next season of the show. It would also add an interesting counterpoint to the fact that John has a sister from whom he is seriously estranged. (Sister Harry didn't accept her invitation to John and Mary's wedding.)
I would have made a comment about this where the question about a third sibling appeared, but I don't have enough reputation to comment.