This is how to get a free family trip to Paris this spring

Sunshiny stomps through the Palais-Royal, gawping at the Eiffel Tower (or at the Parisian streets unfurling below from its viewing platforms), expanding budding scientific minds at La Cité des Sciences et de l’Industrie or inspiring little artists at the Louvre – Paris has a lot to offer for family-friendly getaways. But whisking the whole brood off to the City of Light doesn’t come cheap – which is where Airbnb and Eurostar step in.

The two travel stalwarts are teaming up to offer 10…