How do I connect a particular textrect instance to a group of 9 textrect instances

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:bust_in_silhouette: Asked By cloa513

Node tree is GC being grid containers → showing child relationship
Node2->MainGC->SquareGC-> MTGC->Subtile2
->GC3-> Maintile
There is exactly one Maintile decided at the start of the game for a group of 9 Subtiles also decided. How do send a message from the Subtiles to the Maintile and back?