Every family member needs a valid passport. It sounds obvious, but this small detail is the one that most often pushes back a move.
At the very start, check:
- passport expiry dates for every family member;
- document requirements for your visa;
- apostilles and translations;
- documents you will need not only to apply, but after you arrive: for address registration, school and the bank.
It's calmer to do this in the first week of planning, not a week before your consulate appointment.