Was TJ for an U12 game last Sunday. Opposition player is running down the wing with the ball, gets tackled by one of our players. Tackler goes into touch but attacking player and ball are in FoP, tackler still has hold of attackers leg and pulls it onto his body which is on top of the touch line. Is the attacking player in touch? His leg never touched the line or the ground only the body of the defending player who was on the touch line.
First of all, welcome to these forums. It is awesome that U12 is taken seriously enough that you ask this question; I've never had TJs for the minis.
As you describe it, I would not raise the flag, even if I were AR for an international match (as I have been for U18). Although I can't see anything in law to support the opposite view either, my main argument comes from continuity of play. When there is no safety issue, I would rather not whistle.
It seems, from your description, that this was your own interpretation too, and that perhaps a parent or even coach from the other side disagreed.