Onboard the MG the restaurants included for kids in FH rooms are the ones that have an upfront surcharge - Rudi's Seagrill, the Steakhouse, Teppanyaki. The a la carte upcharge places are not included, Emeril's Bistro, Bonsai Sushi, and Seafood Shack. Cucina, Chi-bang and Guy's Pig and Anchor are complimentary to everyone on the ship.
I know others in FH rooms have struggled with this in the past because the current online booking system does not recognize your FH status when pre-booking dining that you pre-pay for such as Teppanyaki. They've been told they need to book onboard to receive the complimentary child reservation which is a real crap shoot for Teppanyaki since it is usually completely sold out. Honestly I would book now and try to sort it out on the ship if you really want to partake in this experience.
I took my 4 year old and there was no kids menu for her, she ate what everyone else ate. She didn't eat $35 worth of food but really enjoyed the experience.