Anna Van Patten is hardly the first of her clan to turn up on a hit TV show. She comes from a Hollywood dynasty that stretches back more than half a century, to the days when her uncle starred as jovial dad Tom Bradford on the relentlessly wholesome ABC family drama Eight Is Enough . The difference, of course, is that unlike Anna, who just made her Euphoria debut on May 3, Dick Van Patten never had to work the pole at a desert strip club called the Silver Slipper. The closest to transgressive he ever got was peering over his newspaper to cast a disapproving glance when one of his TV daughters came home after curfew. “I’ve never actually seen an episode of Eight Is Enough ,” Van Patten, 27, admits. “I mean, I’ve seen small clips. I know, it’s embarrassing.” There’s a decent chance you’ve seen Anna before, possibly even in full episodes.…