Daddy's Little Villain

4 vs. Satan:
*NONE
Alex in Princess Quest:
*Felicia, the daughter of Malthor van Dracula.
The Stone of Power:
*RM: Shania is Balthar's daughter.
The Three Kingdoms
*NONE
Dragondawn
*NONE
Harter Knall
*Anginia, the daughter of Gergun. It's possible the other four members (two female and two male) are also related to their boss, though this isn't confirmed.
Hero Story
*NONE
Kill the Demons
*NONE
Satan Saga
*Millie is Trianuk's daughter.
Story of Hero:
*NONE
The Legend of Devils
*NONE
The Sidestory Duology:
*NONE
The Time Of Bloody Fear:
*Feeza is Maltros' daughter.