Learn French: Je me gare dans le garage chez mes parents. - I park in the garage at my parents' place.

While à la maison de literally means 'at the house of', French speakers almost always use the preposition chez followed by a person (like mes parents) to say 'at someone's house' or 'at someone's place'. It sounds much more natural.

Why is there a me in Je me gare?

In French, 'to park' is usually the reflexive verb se garer when you are parking the vehicle you are currently driving. Because it's reflexive, the je pairs with me. If you wanted to state exactly what object you are parking, you would drop the me and use the normal verb: Je gare la voiture (I park the car).

Could I use chez for the garage too, like chez le garage?

No, you can only use chez before a person (like a name, a pronoun, or mes parents) or a person's profession (like a dentist). For a physical place, room, or building like a garage, you need a location preposition like dans (inside) or à (at/in).

Does the word chez change because mes parents is plural?