Lloyd and Meadow's kid:
Juniper

Zane and Crystal's kids:
Celena & Chryssa

Flare and Kai's kids:
Ashley & Ashton:

Nya's and Ronin's(?) Kids:
Brook & Indigo

Cole and Jay's Kid:
Nicole & Gordon

Midnight and Tylor's Kids:
Winter, Dusk, & Fawn

Morro's Kids:
Melody & Kaze