Because this. This is actually mostly my head canon for Thicker than Water, or at least one relationship in it. But still. A drabble.
Martin always calls his father “Mr Holmes.” Even as a scared four year old, Martin had not tried to call him anything else. Especially as he got to know more about the man who fathered him.
That wasn’t to say he didn’t like Mr Holmes. He had, of course, brought Sherlock to see Martin every summer for years. He had been the one to push their meeting in the first place with some legal strings regarding custody or rights or something like that. But…well that’s all he was. Like a friend’s father really, someone you know who you are extremely polite to and make awkward small talk with whenever your friend wasn’t there.
Minus the small talk because Holmes do not do small talk.
And it was so hard to not compare Mr Holmes to Martin’s dad. To the man who had given him piggy back rides and helped him pretend to be a plane. The man who would come home anything from slightly tipsy to drunk after Friday footy matches and dance around the house, Martin in tow until something got knocked over.
To the man who had tried, in his own misguided way, to help his son survive if not to get his dream job.
Well there was a reason Martin only called one of them Dad.