A big difference, that what..
I can't comment on Jermaine and Randy's affairs, they are not as well documented as Joesph's. All I know is that Jermaine had an affair with Randy's wife, I can't remember if she had Jermaine's children before or after she left Randy. But Randy wasn't pleased and they didn't speak for quite sometime. I'm aware Jermaine has children from an affair or affairs whilst still married to Hazel Gordy, and obviously as a whole family the children would be excepted by the Jackson's, but do those children have a good realtionship or close realtionship with his children with Hazel Gordy. That's the thing, how to siblings except each other, not the Jackson family as a whole. Joesph's daugther from his affair may have a good realtionship with the wider non famous Jackson family who aren't the offspring of Katherine, but not with Joesph's children and family contected to Katherine. The point you mentioned about Jermaine and Randy is interesting, and shows how complex relationships withing the Jackson family is.