For future reference, the boys all finally had their annual checkups a few weeks ago and here are their stats:
H: 57lbs, 51 inches tall
O: 75lbs, 58 inches tall
B: 75lbs, 59 inches tall
So yeah, they're giants. Owen took solace in the fact that, although Brendan has the height advantage, Owen technically weighed in 0.2lbs heavier, which he promptly assured everyone was "ALL MUSCLE." He's not wrong.