Learn Portuguese (Portugal): Eles passaram a viver na autocaravana e não tinham nada que esconder. - They started to live in the motorhome and had nothing to hide.

When the main clause has an indefinite pronoun like nada, algo, or tudo, we connect it to the infinitive verb with que. This forms an infinitival relative clause, essentially meaning "nothing that could be hidden." While you might hear nada para esconder in casual speech, nada que esconder is the grammatically standard way to build this specific structure.

What is the difference between passaram a viver and começaram a viver?

Both can translate to "started to live," but passar a followed by an infinitive strongly highlights a transition into a new, ongoing habit or phase. While começar a simply marks the beginning of an action, passar a viver implies "from that point onward, their new reality was living in the motorhome."

Does não tinham nada literally translate to "they didn't have nothing"?

Yes! Portuguese uses double negatives naturally. Whenever a negative pronoun like nada appears after the verb, the verb itself must also be negated with não. Saying não tinham nada is the standard way to say "they had nothing" or "they didn't have anything."

Is autocaravana the only word for a camper or motorhome?