Charles IV was also the brother of another twice great - grandparent , Ferdinand I of the Two Sicilies ; they were both sons of Charles III of Spain and Maria Amalia of Saxony .
Head entity: maria amalia of saxony Q169512 30 31 32 33
Tail entity: charles iv Q183226 0 1
Relation (head \u2192 tail): P40
Inverse relation (tail \u2192 head): P25