I do not think this is a question of etiquette, it is merely a question of family tradition,and circumstances.
Until this thread, it wasn't something I had ever thought of. My family have our traditions, which work round not seeing each other often, because of the distance, a grand family tradition of passing stuff round, from furniture to clothes, to food, to being inveterate charity shop, junk shop and car boot obsessives who are always snapping up things thast other people would be glad of. So most family visitors arrive loaded with bags of stuff.
I think it is family habits and traditions that control this behaviour in the family, not etiquette.