So a line of Mycroft's may imply the existance of another Holmes sibling. What if Redbeard wasn't a pet dog at all? Instead, Sherlock has deleted his other brother (or sister?) and replaced those memories with the dog we see in the episode because it was the only way he could deal with their death. I'd love to see something about this with John/Sherlock or John/Sherlock/Mary but a gen exploration would be great too.
HLV spoilers, Holmes family history
So a line of Mycroft's may imply the existance of another Holmes sibling. What if Redbeard wasn't a pet dog at all? Instead, Sherlock has deleted his other brother (or sister?) and replaced those memories with the dog we see in the episode because it was the only way he could deal with their death. I'd love to see something about this with John/Sherlock or John/Sherlock/Mary but a gen exploration would be great too.