I know etiquette dictates that there should be one invite for every adult, regardless if there are multiple people in the same household. I am not arguing that. But what does etiquette suggest with STD since ours are magnets? I think it would look kind of silly with 3 different STDs on the fridge. Although they may not all be kept on the fridge, it may happen. He would hand deliver them to his aunt and cousins. Is it rude not to send 4?