I'm guessing paella is too difficult to cook for kids, I dunno, I only went to the Basque Country once and all I remembered was the hot summer.
País Vasco, along with the rest of North Spain, is the cold side of the country. Despite being a relatively small country, different regions of Spain are almost like entirely different places of the world. In North Spain, and this includes Basque Country, the temperatures during summer reach about 25 to 28 degrees maximum, which by general standards (central and south spain) is cold. It depends on who you ask, different people from different regions have different tolerances to temperature, since they are extreme depending on where you live.
For example, here in Andalucía, in regions like Jaén, Córdoba or Sevilla, temperatures during summer reach about 42 to 45 degrees every day. From where I am, this is a normal week during July:
Even spanish folks living in the north, like Galicia, Pamplona, León, País Vasco, etc, have to be very careful when traveling to Andalucía because this temperatures are dangerous, even more for people from the UK, France, Germany, etcetera, who are not used to this weather. What I mean by this is if you felt hot in Vasque Country (which is completely normal, since Vasque Country temps could be considered high by other countries standards) at 20 something degrees, imagine at 43 or 45.
Paella is only in a region of Spain though.
Paella is typically from Valencia, and is also consumed a lot in south Spain, but you can eat it everywhere. Like, every person in Spain knows what paella is and you can eat in in Madrid or Ciudad Real, to say something.