There is also the small matter of Scotland international Phil Godman in the way of Blair junior's path to first team rugby - yet Alex maintains he is not ready to start any family feuds in pursuit of the No.10 shirt.
He said: "Obviously, David and I will both be competing for the number ten shirt so things might get quite intense between us.
"I haven't actually spoken to him and David a great deal at training because we are all focused on our rugby.
"We're three very competitive guys but I don't think it would ever boil over between us on the training pitch, no punch-ups or anything like that I hope.
"The good thing is that we get on well as brothers, so what I don't think rugby would ever come between us, although there is always a bit of rugby banter between us which is good fun.
"But don't forget we've also got Phil Godman at the club who has been playing a lot for Scotland recently so it's not just us two who will be competing for the same position, but Phil too."
Long talked of as a future golden boy of Scottish rugby Blair is as quick as fly-halves come is also an exceptional distributor.
The surname has only added to the hype but Alex maintains there was no pressure from his family to follow in his brothers' footsteps.
He said: "Our parents are obviously very proud of what the three of us have achieved.
"We had got a warm-up game last week which our parents came along to watch. David will be playing the first half and I'll be playing the second, so that was very diplomatic of the club."
Strangely, the Blairs would be only the second set of three brothers to represent the capital club after Iain, David and Kenny Milne in the 1980s.
But before that becomes likely Alex will go into training for the Commonwealth Games in Dehli after being picked as part of Scotland's Sevens squad.
"Us all playing at the same time for Edinburgh is something to think about as it would be incredible if it happened, but I don't want to look too far ahead," he added.
"I'm not really a fan of talking long-term goals whether that is playing with David and Mike or playing for Scotland. I'm only 19 and I just want to fight for my place at Edinburgh and get settled.
"Some of the players we've got here are fantastic and I can't wait to get out on the pitch with them.
"Nick de Luca, Ben Cairns and Esteban Lozada are all great guys I'm looking forward to playing with and I hope to learn a lot of them."