Here are Wolfgang and Nightshade's children, Dr. Krankcase and Luminous' children, and Gulper and Chef Pepper Jack's children during childhood.

Wolfshade: Top Panel

Night Howler: 7

Nocturnia: 6

Andrew: *Adopted* 6

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Lumikrank: Middle Panel

Blacklight: *Son of Luminous and Spellslamzer, stepson of Dr. Krankcase* 8

Boltclank: 7

Sunny Star: 0/Newborn

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Gulperjack: Bottom Panel

Magma Blob: 8

Chow Down: 8

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Also voice actors for their younger selves while young Nocturnia *Sounding like a young Rarity from My Little Pony: Friendship is Magic* keeps Tabitha St. Germain and baby Sunny Star keeps Sandy Fox.

Night Howler: Alexis Tipton

Andrew: Kara Edwards

Blacklight: Alison Viktorin

Boltclank: Wendee Lee

Magma Blob: Kath Soucie

Chow Down: Elizabeth Daily

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Trivia:

Magma Blob and Chow Down are months younger than Blacklight even though they're the same age, while Night Howler and Boltclank are born on the same day while Bolt is a few minutes younger than Howler, Nocturnia and Andrew are the same age but he's born a few days after she was born.
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Each of Dr. Krankcase and Luminous children have half siblings and step siblings:

Blacklight has a half brother that is the same age but younger named Torino *Belongs to  Vriskafan111* through his biological father Spellslamzer and Feferi Peixes from Homestuck *Who he kidnapped and raped her in mine and Cathy's role play together where Blacklight came from*, while his step siblings are Spy Rise *That depends if whether or not he's Krankcase's son which is up to Activision to confirm* and Boom Bloom *Who Krankcase created* which the two are also half siblings of Boltclank and Sunny.
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Drawn on Comic Workshop 2.

Wolfgang, Nightshade, Dr. Krankcase, Luminous, Chef Pepper Jack, and the Gulper © Activision

Night Howler, Nocturnia, Andrew, Boltclank Krankcase, Sunny Star Krankcase, Magma Blob, and Chow Down © Me

Blacklight © Me and  kattymouse now known as  vriskafan111

Comic Workshop 2 © Collavier