休日の西住家4
さすがは家元、器が大きいですねぇ!

A Day Off at the Nishizumis' 4
That's the school head for you--she can keep so much on her plate!
器 literally means "bowl/vessel", but can figuratively mean "capacity/ability", so 器が大きい (literally, "the bowl/vessel is large") means to be tolerant, big-hearted or open-minded.