nope - no need to tell him anything... So no orders in place? you can do what you want. Do a google search of shared parental responsibility.... You have an obligation to seek mutually satisfactory solutions to major long term decisions, like school, major medical procedures, residential location.... BUT - routine stuff like what you're gonna do in the school holidays have nothing to do with him AS LONG as the time you're taking the kids to Canberra does not impact on any agreement you have with him about when he sees the kids...