Absolutely not. We aren’t quite sure what you are referring to because Dualscar has treated Eridan so far as nothing less than perfect. The banter between him and Cronus is just how Dualscar shows his love (he’s hard on him but wouldn’t use violence.)
Dualscar loves both of his children, especially Eridan.
Dreamsandpocky and I wouldn’t joke about child abuse. We are sorry you took it that way.