i got this potty for layla
and logan has been pushing her of it cause he wants to go on it

she then screams at him and pushes him back. yikes. i don't really know what to do. i can't afford to get another one at the moment as it was £40 and i keep telling them stop and encouraging them to share it but they both want it and don't want to share.
i've moved it out of the way for now.
what would you do?