Count, it's complicated, but at first they thought that my brother's fiancee and baby would be spending christmas alone (without my brother or ny other family nearby) so they booked tickets to go to Australia, with her family.
Erm, they know if it's day or night in the same way every living thing does; it gets dark at night!
Perhaps try bright lights when he is supposed to wake and blackout curtains when you want him to sleep?
The current advice for avoiding jetlag is not to eat or sleep on the journey and to then immediately go by the meal times, etc in the new location. However, with a baby you can't really do this can you.
I think there's going to be a few days of shortened naps etc.