Why didn't the Watts family join the author for lunch?

Responses

They didn't like the food.
They didn't like the food.

There wasn't enough food.
There wasn't enough food.

They didn't have any money.
They didn't have any money.

They ate already.
They ate already.

give a real answer

One possible real answer could be:

The Watts family didn't join the author for lunch because they had prior commitments or had made plans to eat somewhere else.