Do capers belong to the onion family?

Capers do not belong to the onion family. Capers are actually flower buds that are harvested from the caper bush (Capparis spinosa). Onions, on the other hand, belong to the Allium genus, which includes plants like onions, garlic, leeks, and chives. While both capers and onions are commonly used in cooking for their distinct flavors, they are not botanically related.