It's interesting, that's for sure (assuming this is a genuine question). I imagine this must be a dilemma for quite a few people, who have relatives working in the business. I wonder if the fact they're your sister/mother/daughter/niece or whatever, mean you just don't find them attractive. Or are there people feverishly wanking themselves into a coma, watching their family members getting naked and fucking.
As for whether it's right or wrong, that's purely a personal decision for you, I imagine. I assume your sister doesn't know?
^And does the fact she's your sister add anything to the enjoyment as you consort with Madam Palm and her five lovely daughters? An extra frisson of the taboo?
I'm sure on some level it does because I quite enjoy other videos with real family members. I've wanked to the Romains of the Day trailer so many times.
I do not believe this to be true, but in the off chance it is true:
"is that wrong?" : in public/out loud -YES.
"is that wrong?": in private - No, and i am sure a lot of other guys do (or definitely would) watch their sister/mother/daughter/niece maybe as a case of base curiosity before before finding out they enjoy the combination of familiarity/taboo of it.
What turns you on by watching her movies? What do you like in her videos? Is it full hardcore content? Does she know that you do? I think its sketchy topic watching your sibling or close relations. Its good to share experience and sexuality despite it being tricky subject for some. I've come across Monica Sexxton (daughter) and Jessica Sexxton (mother) they have starred in couple scenes together and alone. How ever they were keeping to guys and no lesbian action being mother and daughter. Generally video involved rough sex. It can be done but with certain distance and rules. However yo have sex with others in same room. Watching porn often involves picturing your self in the scenario with porn star in the video. That be the sketchy part. But maybe keep it down low that you watch her scenes.
99.9% of all red-blooded heterosexual guys with a hot sister has wanked himself silly thinking about her at least once in his life. So I can only imagine bro locked up in his room with volumes 1-12 of Lesbian College Sorority Sisters Gone Wild...