Why... what even is the logic of an academy arc now? They have already shown he's pretty much the sole leader in his area, he has no parents. I assume that 'I think of you as my Father' line means that the butler will be put fully in charge?
Either way, this should have been done at the start. He has nothing to learn at an academy. He and his wife are fully grown adults now, with leadership experience, power, wealth, spouses, and soon to be kids. The heck are they going to learn at school?