[IYAS9YAS]

The family did not book a seat for the two-year old so were not entitled to it.

They paid for the seat. Doesn't matter which kid used it.

[Sacajaweau]

Yes it does....a two year old MUST be held on a parents lap.

[TalonDJ]

“They paid for the seat. Doesn’t matter which kid used it. “

But it does. Who paid is not at all important. The name on the ticket is the only person entitled to sit in that seat. Period. If they didn’t change the name then they can’t use it. The ‘owner’ of the seat was not there, regardless of who’s money was spent.

[cornfedcowboy]

They paid for the seat. Doesn’t matter which kid used it.

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Of course it matters. I bet they didn’t scan the boarding pass at the gate and the gate agent assumed the seat was open and available. There wasn’t a problem until they sent passenger (probably standby) to occupy the seat.