"Who is training Whom?"

We are now in the potty training phase  and this is my recent conversation/interaction with my 2 year old.
Mama: Arjun, do you want to go potty?
Arjun: NO
Mama: Lets go, we can use the big boy potty..
Arjun : NOOO
After few failed attempts with Arjun to potty train, I gave up and we carried on with our daily stuff.
Later, when we were playing this is how the conversation unfolds:
Mama: Arjun, mama will be right back
Arjun: Where going?
Mama: I have to pee
Arjun so happy and all excited jumps up from his seat and holds my hand and runs...
Mama: Arjun, where are we going?
Arjun: Mama sit big potty...

At that point I wasn't sure about "who is potty training whom" ..