Then you shouldn't let them climb all over another child's wheelchair and almost knock it flying and then use the excuse that there's nowhere else to go.
Fine, if there's nowhere else to go and there's space in the disabled area, by all means use it, even if staff have kicked you out twice already, but must you really put my child at risk because you can't be bothered watching your children?
Or am I being PFB about it all? I am often.