Rant , my mom is finally ok with this series after 15 yrs

Growing up I was never allowed to read these books cause my folks literally thought they taught kids about the occult . I thought so too til I got older and started liking the books in secret . Now I am 30 yrs old ( still living at home cause rent is too expensive here and I won’t rent with strange roommates)I’ve passed by so much merch that I wanted to buy but wouldn’t because of Dad ( didn’t wanna fight ) . This Christmas my 13 yr old niece asked for them for Christmas and my mom got her book 1 . I’m so mad , why change her mind after all these years ? I told her I’m not hiding the fact that I like HP any longer ( she knew for years but didn’t tell Dad ) . Why is it that my niece gets to have what I didn’t ? 😑