sheree - with the carseat you can hire one when you hire the car. We did that when we went to melbourne. Otherwise take it with you on the plane. I don't know who you are flying with but some don't include any kids stuff as the baggage allowance. Depends how much stuff you are already taking and if there will be someone to help you get on and off the plane at each end. I completely understand about the whole family dramas. I have sisters and its always all about them, don't think they will ever change.