My 80-year-old grandmother and 12-year-old cousin will be visiting SF this weekend. They're not particularly adventurous eaters, but I'd like to take them to a couple of fun San Francisco restaurants. I was thinking along the lines of Italian, Chinese and/or seafood, which should be within their comfort zone. (And I'm fairly new to the city so don't know too many places yet.) Any suggestions for a place that isn't too loud or trendy that will be enjoyed by both ends of the age spectrum?