If I jump 30 feet into the air with a grappled creature, do we both take falling damage?

@MultiToadIf I jump 30 feet into the air with a grappled creature, do we both take falling damage, and does the grapple end from fall dmg? DM judges, but I'd say both take falling, grappler makes Con save with DC = to fall damage to hold on. #WOTCstaff

— (((Mike Mearls))) (@mikemearls) July 28, 2016

@MultiToadAnd what if I jumped 30 feet into the air, and then released the grapple? Do pcs take fall damage from their own jumps? only if they run out of movement midair – then they fall

— (((Mike Mearls))) (@mikemearls) July 28, 2016