Time to take care of some family business. It seems that your brother and sister have located the whereabouts of your Uncle Antan. Apparently the Rebel Alliance doesn't have any kind of strict policy on time off, because it's time to jump into the Otana and take care of business with the Viraxo.
Ignore the briefing suggestion to head straight for the platform, and take a bit of time to kill the Planetary Defense fighters. The Otana's turrets will make quick work of them, but you'll be a sitting duck on the platform if they're not all dead when you dock to have MK rescue your uncle.
After that it's just a matter of blowing up as much stuff as you're comfortable with, up to and including the Imperial reinforcements.