To clear the confusion: YPG established as the vassal organization of PKK, which takes orders from, and sent its men to PKK when necessary. About TAK, such a group simply does not exist.
PKK likes to aim the women and children of the military staff as a vengeance. (Especially the jet pilots) At past, as an excuse they were simply claiming "Oh, some of our guerillas just went rogue and did the bombing by their own decision." which was not good enough to avoid responsibility.
And now, to have a better excuse, they simply invented TAK. So if an attack kills more civilians than the military personnel, "TAK" claims it. If it doesn't, PKK does.
In this particular case, the bomber is a YPG militia who joined YPG from Turkey, and then back to Turkey as to become PKK militia later. Still, it's impossible to tell if he is PKK or YPG at the time of the attack, because he is both.
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