Learn Italian: I genitori sono stanchi e vogliono riposare in albergo. - The parents are tired and want to rest in the hotel.

Because it follows the modal verb vogliono (they want). In Italian, just like in English, when you have two verbs together like "want to rest", only the first one is conjugated to match the subject (loro vogliono). The second verb stays in its base dictionary form, which is the infinitive (riposare).

Why is there an 'h' in the word stanchi?

The singular masculine word for tired is stanco, which ends with a hard "k" sound. To make it plural to match i genitori, we change the ending to "i". However, in Italian, "ci" makes a soft "ch" sound (like in "ciao"). To keep the original hard "k" sound, we have to insert an "h", making it stanchi.

Is genitori a general word for all relatives?

No, genitori specifically means "parents" (father and mother). It can be a tricky word because the Italian word for "relatives" in general is parenti, which looks exactly like the English word "parents"!

Why does the sentence say in albergo instead of using the word for "the hotel"?

With certain common building types and institutions like albergo (hotel), banca (bank), or chiesa (church), Italian commonly uses the simple preposition in without combining it with a definite article ("the"). This is similar to how we say "in bed" or "in class" in English.