Do you have to sit in your assigned seat on a plane?
After take off, you may be allowed to move seats - but at the end of the day, the cabin crew have final word, they do not have to allow you to move seats, they can require you to remain seated in your own seat.
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Emphatically, no. You will likely get assigned a seat during check-in (though you should still skip it if the airline tries to tack on a fee) or, at the very least, at the gate. Again: You don't have to select a seat in order to get a seat. You just might get stuck with a suboptimal one if you choose to skip it.
Airlines have the right to give your seat away or deny you boarding, even if you have a confirmed reservation and may be on the way, said Justin Albertynas, CEO of the travel-tech start-up RatePunk. He reminded me that airlines overbook flights to compensate for potential (and common) no-shows and cancellations.
As long as you ask though, you should be okay - there are no rules or laws against swapping seats. The best place to sit is actually the back of the plane, according to one flight attendant.
For a short-haul flight where you are only taking hand luggage, checking in online saves a lot of time and is therefore much better than checking in at the airport. If, on the other hand, you have to check in bulky luggage, it is better to use the classic check-in at the airport for security reasons.
So, yes, the flight attendants know which seats in business (or first) class are supposed to be empty, and if someone is found in one, they'll be asked to move... (and if you're on a US-based carrier, it might be a little stronger than just a request!)
The most important rule to make sure you all sit together: Book flights and reserve seats early. That's the simplest and cleanest way. Second, list all family members on the same reservation. If someone booked at a different time, link their reservation to yours.
On many aircraft, the rightmost seats have letter designations HJK, skipping the letter I. This is because each seat has a row number followed by letter; letters that may be confused with numbers (I, O, Q, S, or Z) must be avoided, usually for people with dyslexia.
If you choose not to pay to reserve a seat, your seat will be assigned to you free of charge when you check in, between 24 hours and 2 hours prior to departure.