If you have ever played an Elder Scrolls game and observed the night sky, you'd notice that there are two moons (most notable in Oblivion and Skyrim). They both orbit Nirn, the planet the game is based in. At a closer inspection, it is revealed that the smaller moon revolves around the large moon.
Which brings me to my question: Would it be possible for there to be one large moon with two small moons in close proximity to each other orbiting said large moon that orbits the planet? Or, would there be catastrophic outcomes like erupting volcanoes or tsunamis?
Let's say the planet is Earth but is a 1/3 the size, and the largest moon is a 1/3 the size of Earth's moon and then smaller still (because I've read Earth's moon is abnormally large).