Bonnie Raitt is an established Blues performer. She plays a fine slide guitar. Just check The Healer w/ John Lee Hooker.
I like Bonnie, but she wouldnt be where she is without her father having opened some doors for her. Being married into the blues dont hurt either. Bonnie didnt start off as a blues musician - when she met muddy waters in the late 60s-early70s she hadnt even started to play guitar, and credits muddy as one of her inspirations. Muddy Waters does make it look easy!
I disagree her talent got her where she is today. Her father may have opened the door, but it is what she has accomplished on her own that makes her a great Blues performer. Look at all the other fathers/mother who have opened doors for their children.