Yeah, Children are naturally curious and that is why it is important to always find good and convincing answers to their questions.
Actually, the conversation I want to have with him is not to gain permission per say, it is to make him fully aware. Somehow, he would have known that we have chosen that path and he is probably waiting patiently for us to acknowledge it and make him involved in the decision. My dad is a very calm person and I am very certain it will go smoothly.