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In mid-August, Donald Nunney and Maria Galindo Nunney died in a crash that left their two youngest children seriously injured

More than a month later, Lucia and Leo are back home, although the 10-year-old boy remains hospitalized

As for the future, their eldest brother tells PEOPLE he plans on filing for joint guardianship with their maternal grandmother

It's been over a month since Donald Nunney and Maria Galindo Nunney died during a trip to drop their eldest son off at college. Now, as their two youngest children continue healing from their injuries, their big brother Noah plans to file for joint guardianship with his maternal grandmother.

“I know that my parents would be very proud,” Noah tells PEOPLE in a joint interview with his sister, Lucia, 15, and brother, Leo,

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