A twin G class solar system is kinda like the Alpha/Beta Centauri system. There, two main suns orbit each other with a third red dwarf, and everything else orbits them. Depending on the inter-solar distance and barycenter, planets in such systems may follow peculiar orbits. For example, a rocky planet like ours may orbit in and out of the Habitable Zone, so hard for life to arise.

Make your own star system and play with it.
Click Lab and then the pull down for binary star, planet.
Turn on Path to see planet's wild orbits in a binary star system. There are other systems too.