Here goes...
Fresh and his brother, Glowstick, had a caring father until Fresh got infected with his parasite. Then Fresh!Gaster completely disowned his son and said if he came near Glowstick again, he'd tear Fresh to pieces and use his dust in lab experiments. He's overprotective and regrets not being able to help Fresh before he got infected, so he's determined not to let his "former" son hurt his remaining child. The worst part is, Fresh knows his father is right, he'd likely hurt Glowstick if he got too close to him.
Frisk is Toriel and Asgore's biological child in
A Fresh Friend. They're very tender and loving, but can't stand each other.
Yes, Roman is Delaney's biological father. This will be explained later in my current chapter. They both play very important roles in my story.
Nim was a very good mother. Unfortunately, she fell under a sleeping curse when the twins were little, and neither of them has any idea how to break it.
These are both my alternate universes. None of this is canon to Crayon Queen's, Joku's, or Toby Fox's characters.