Yep, Lunar/Comet's family is part of my next gen, since Eclipse is Luna and Celestia's cousin, and Eclipse has her own kids.
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After talking it over with her husband, Queen Lumina Eclipsa, commonly known as just Queen Eclipse, scheduled a trip to visit her older cousins Princess Celestia and Princess Luna.
After telling her children, they all looked forward to the trip, except Star Riser. She didn't want to leave because her dad and wasn't going to go with them. (King Cloudy Skies wasn't going because he had to watch over the kingdom.) Lumin, after hearing this, tried her best to persuade her to go.
Lumin Essence: Heeeey there, Star Riser! Are you ready for the trip??
Star Riser: I told you, I'm not going.
Lumin Essence: C'mooooooooon!! It'll probably be a looooooooooooong time 'till you'll get to see mom's cousins again!
Star Riser: I said I'm NOT going. Now leave me alone!