well.. it seems your dad is alpha and you and your mom are just siblings, in which case he plays like that to show he´s the dominant pup...

it may be hard but i think what yo are doing: saying no, walk away, ignore...etc.. should work.. but it seems he doesn´t even gives a cookie to that...

maybe try the opposite.. reward him when he´s NOT doing that, so he knows being nice would give him a treat, so he´ll have somehting to look forward instead of just playing rough on you and expect you to leave or "ground" him but no good out of it for him in that...

I have another friend with a beagle also 8months that say she´ll chew everything and even more while she´s watching and saying no to her... seems beagles are full of energy (and i don´t say it in a bad way) just that maybe their hound instinct calls for you being ahead of them