Flores, the sister of Louise Turpin, said her brother-in-law would constantly make her feel 'uncomfortable ' when she stayed with the family.
Appearing on Good Morning America, Flores explains, 'If I were to get in the shower, he would come in while I was in there and watch me.
'It was like a joke. He never touched me or anything.'
Ms Flores reportedly lived with the Turpin family when they had just started their now large family.
'I was treated like one of the kids, kinda, so I had rules,' she explains. 'I thought they were really strict but I didn’t see any type of abuse.
'Now that I’m an adult and I look back I see things I didn’t see then.'
Ms Flores was surprised by the revelation that her sister and brother-in-law had kept their 13 children chained, shackled and locked inside their home in such horrific conditions.
She further told Good Morning America, 'I was shocked because my sister and I really haven’t had a sister relationship for about 20 years, other than maybe a call every once in a while and sometimes those calls were like a year apart.
'I was shocked, I was devastated, just much like the rest of the world.
'We all want explanations just like everyone else, probably more so.'
Ms Flores goes on to explain that her sister and husband had remained estranged from their wider families for over 20 years, so they had no indication anything sister was occurring.
'When that happens for 20 years, and it was before the kids even were there, you don’t think it’s abnormal. They were always funny and private anyway, even before they ever had children,' she tells.
When asked if she had a message for her sister, Ms Flores broke down.
She pleads, 'I want her to know that she’s still my blood and I love her.'
'I don’t agree with what she did and her actions have made the whole family suffer. But I want her to know that I’m praying for her salvation and that we do love her.'
David and Louise are due in court on Thursday.