Meaning of "Diese Haushaltsgeräte haben meine Eltern" using grammar
The sentence "Diese Haushaltsgeräte haben meine Eltern" logically means "My parents have these home appliances" and not "These home appliances have my parents" (unless it's a science fiction comedy/horror movie :-D). Having said this, is there a grammatical hint that tells us "meine Eltern" are the subject even though they are placed last in the sentence? "Meine Eltern" would be written the same in the nominative and accusative case, so would "Diese Haushaltsgeräte", right?
The German language is a lot more flexible than english, because of the cases. To illustrate, both "Der Hund beißt den Mann" and "Den Mann beißt der Hund" means "The dog bites the man". The subject is in nominative, and the object is in accusative in both sentences. The difference is the focus, in the first sentence the focus is on the dog, but in the second the focus is on the man. This could be used to clarify or answer questions, for example, "Wen der Hund beißt?" (Whom is the dog biting?) "Den Mann beißt der Hund" (The man [is the one who] the dog is biting). This difference is more noticeable when the parts are masculine, like in my example, but in your sentence, both the subject and object are plural, and plural doesn't change when is in accusative, but logic dictates that is the parents who own the appliances, and surely the sentence is build this way to focus on the appliances.
PS. Sorry for the wall of text, I just wanted to explain clearly WHY is that some sencences follow this structure