The Sister, Sister twins appear in Style's Tia & Tamera, which follows Tia's pregnancy and Tamera's engagement and wedding to Adam Housley.
Asked how much say she had over what was shown: Tamera told Digital Spy: "Not that much! At first Tia and I tiptoed around the situation, kind of being protective of what we said and did.
"The producers had a little talk with us and they were like, 'Listen, the only way people are going to relate to you is if you are fully yourself. You have to be able to let your guards down and be free, and just let go. That's what people are going to relate to'."
She added: "We didn't have much control - say we did something that we didn't like, you can't go to the network and say, 'We didn't like that'. They would say, 'Well, that was reality - we shot reality - you can't change reality!'
"You'll find out that Tia and I are two very different people, and people will relate to us. Most of all sisters, because sisters are never really alike."
> Read Digital Spy's full interview with Tamera Mowry
Watch a clip from Tia & Tamera below: