Harvey is in full-time care, year-round, although he does occasionally come out at weekends and for things like Christmas. This has been documented in the TV programme, Harvey and Me.
It would appear that Junior and Princess have lived with their father and step-mother for a number of years now and she seems to have very little contact with them, particularly Junior.
Jett and Bunny, the youngest two, also lived full-time with their father with Katie seeming to have a couple of hours' supervised visitation per week. Allegedly, her most recent partner was not at one point allowed anywhere near them. Make of that what you will.
Katie broadcast on a recent IG post that she now has full custody of those two, but it appears that there is something odd going on about this. Who knows? She is the master of smoke and mirrors.