Hopefully someone call help or in the same position!

i currently have 3 kids and own a Falcon. Obviously all my back seat is full and I have #4 on the way in May.
Until tonight, the plan was to drive DFs car (7 seater) but its manual and I can only drive auto and the thought of learning is stressful! Anyhow, he came home from the shops tonight saying that I can still use my car and DD1 aged 6 can sit in the front seat using a booster. I looked into the laws and found out this can be done:

If all rear seats are being used by children under 7 years of age, children aged 4 years to under 7 years may travel in the front seat, provided they travel in a booster seat.

Has anyone else done this????


Obviously if we all go out as a family then ill need to put all 4 seat into DF car (pain in the butt!!)