I mean except when David (Kevin) was first introduced but I don't really count that. I feel like it's rare for an older sibling's girlfriend or boyfriend or spouse to be so kind to the younger sibling especially if the older sibling is regularly cruel to the younger sibling like Darlene is.
Fellow David solidarity
Roseanne: "Who the hell are you?"
David/Kevin: "Mark and Becky asked me to babysit Deej."
Roseanne: "Oh, and where is Deej?"
I may be crazy but I’m pretty sure it was “Steej” 😂