It's happened 10 times now, and two different generations of Bondses have been involved.
A day later, and I'm still giddy about the Giants hitting back-to-back-to-back home runs on Opening Day. My favorite part was when the three Giants hitters hit the ball over the fence in three consecutive at-bats. It hadn't happened in almost 10 years.
Thanks to a valued Twitter user who knows how to massage Retrosheet better than I do, we have the full list of back-to-back-to-back home runs in San Francisco Giants history. It's happened a cool 10 times now, and this is a list that should live on the Internet in the form of an article like this.