What is the difference between “patria potestad” and “guarda y custodia” in Spanish family law?

One of the most common confusions in family proceedings in Spanish law is between the concepts of “PATRIA POTESTAD” (parental authority) and “GUARDA Y CUSTODIA” (guardianship and custody) of minor children. Parental authority is the right and duty of parents in relation to their children. The Spanish Civil Code establishes that it shall be exercised [...]