I can so relate, and I am also so very sympathetic to the events that took place in your life, as I endured similar from age 5 to about age 14, but was shamed more so than anything. My sister took great pride in teasing me, shaming me, and humiliating me when my folks weren't around, not like they couldn't and didn't do it their selves. Their versions of shaming me was essentially putting me on public display for being such a "big baby" I would be taken various places, and my diapers were on clear display for ANYONE, ANYWHERE, at ANYTIME to bear witness to me being diapered like a big baby... trust me this did a number on my self esteem, and social skills growing up. And yes spankings with belt, switches, or what ever else was handy when I acted out to try to defy their idealism was well used. Still have scars to this day on my rump, back, and upper legs from those days.... boy I tell ya I really don't like thinking back to those days.