Loooooong story short, me (34) and my sister (39, a crank!) basically fell out a long time ago (my parents also had to wash their hands of her) and over the past 6 months or so, she has decided to divulge my 'secrets' which I confided in her with over the years, to my parents, but in relation to guys I've dated, or affairs / flings I've had. My parents told me they "didn't think I was like that" - obviously thought I'd never had sex and my children were conceived by immaculate conception 
. Anyhow, a recent 'fling' I've had (I've been single now for 8 months) she has found out about and yet again, decided to divulge this to my mum. Now, I'm getting the sh!tty texts from my mum, telling me I'm wrong for having sex with a guy etc, and I'm sat here like a quivering wreck in case my dad finds out - he would disown me! I'm 34, AIBU to think my sex life has nothing to do with my parents and is my business??