NO. This is simple - no.
Depends on age. If this is a concern for one of your children, then yes. Routine palatal expansion (if needed) can be done quite easily. If you are an adult, it depends on the amount of expansion that you may need, as there are limitations to what can be done non-surgically and still not cause harm to other structures in the mouth. Speak to an orthodontist in order to have the proper evaluation.
No. Not at your age. Kids perhaps. See an orthodontist.
Can't agree. There may be ways to widen and expand the arches non-surgically. Find someone trained in neuromuscular orthodontics and functional orthodontics.