Mira and lira
they're two sisters, Johns kids. When the planet burnt down, something happened to them and they became one. They found themselves on a moon, lightyears away from their planet. The mom is assumed dead and they're trying to find their father who was off-world at the time. They don't know how long it's been but just hope that John is out there somewhere.
It's been a hundred and thirteen years but John went into stasis when his crew heard about the planet destruction and about the same time he came out is when the sisters came back.