Just because I read the post below.

So I have always booked our holidays, at the time of booking I have always booked our seats to all sit together.

Like I have booked all our seats together, so the kids arent at opposite ends of the plane to me.

So if you are single and say book a seat next to the window, seated next to you is a parent and they ask you to switch seats with their child who is agead and say an aisle seat. What would you do?

You have paid for your seat, as when you get a flight you tend to have to pay for a chosen seat whereas they allocate a seat at the airport for you to be placed by the airline.

This has always come up on my feed for things, personally I wouldnt swap. I paid for the seat I wanted etc.