These is Infinite and their kids. There is really not a plot to any of these stories. Any other idols/characters may appear. 

WooGyu (Sujin)

YaDong (Mija, Yohan)

MyungJongYeol (Sungki, Myunghwa)

*This is not in relation to a story idea of idols and their families. That's still floating around in my head.*