Title: Ptolemy V Epiphanes
Content:  Ptolemy V Epiphanes Eucharistos (, Ptolemaĩos Epiphanḗs Eucharistos "Ptolemy the Manifest, the Beneficent"; 9 October 210–September 180 BC) was the King of Ptolemaic Egypt from July or August 204 BC until his death in 180 BC. Ptolemy V, the son of Ptolemy IV and Arsinoe III, inherited the throne at the age of five when his parents died in suspicious circumstances. The new regent, Agathocles, was widely reviled and was toppled by a revolution in 202 BC, but the series of regents who followed proved incompetent and the kingdom was paralysed. The Seleucid king Antiochus III and the Antigonid king Philip V took advantage of the kingdom's weakness to begin the Fifth Syrian War (202–196 BC), in which the Ptolemies lost all their territories in Asia Minor and 
Title: Ptolemy V Epiphanes
Content:  Ptolemy V married Cleopatra I, daughter of the Seleucid king Antiochus III, in 194 BC and they had three children, who would rule Egypt in various combinations and with a great deal of conflict for most of the rest of the second century BC.
Title: Ptolemaic Kingdom
Content:   Ptolemy V Epiphanes, son of Philopator and Arsinoë, was a child when he came to the throne, and a series of regents ran the kingdom. Antiochus III the Great of The Seleucid Empire and Philip V of Macedon made a compact to seize the Ptolemaic possessions. Philip seized several islands and places in Caria and Thrace, while the battle of Panium in 200 BC transferred Coele-Syria from Ptolemaic to Seleucid control. After this defeat Egypt formed an alliance with the rising power in the Mediterranean, Rome. Once he reached adulthood Epiphanes became a tyrant, before his early death in 180 BC. He was succeeded by 
Title: Ptolemy Epigonos
Content: Ptolemy Epigone, also known as Ptolemy the Epigone, Epigone (Epigonos) i.e. the heir, he is known from an inscription at Telmessos. The sons of the Diadochi of Alexander the Great were widely referred to as the Epigonoi or the heirs. This also reveals his succession status and relations to the Ptolemaic Kingdom, the kingdom of his late father and being the brief heir to the kingdom of his mother and his uncle Ptolemy Keraunos. ; Ptolemy Nios or Ptolemy ‘the Son’, which he was known during his co-regency with Ptolemy II as he was the adopted son and supposed first intended heir of Ptolemy II. ; Ptolemy ‘the Brother’, refers to his relationship with Ptolemy III. ; Ptolemy of Telmessos, this was his title when he ruled Telmessos. ; Ptolemaios Lysimachou or simply, Ptolemy, son of Lysimachus. The identity of Ptolemy is perhaps the most confusing and controversial of Ptolemaic genealogy. Ptolemy is also identified as the following:
Title: Ptolemy V Epiphanes
Content:  Ptolemy V was the only child of Ptolemy IV and his sister-wife Arsinoe III. The couple had come to power relatively young and ancient historiography remembered Ptolemy IV as being given over to luxury and ceremony, while leaving the government of Egypt largely to two courtiers, Sosibius and Agathocles (the latter being the brother of Ptolemy IV's concubine Agathocleia). In his early reign, Ptolemy IV successfully defeated the rival Seleucid empire in the Fourth Syrian War (219-217 BC), successfully preventing the Seleucid king Antiochus III from seizing Coele Syria for himself. His later reign, however, was troubled by native Egyptian 
Title: Ptolemy Epigonos
Content:  Ptolemy was the first son born to Lysimachus and Arsinoe II. Ptolemy had two younger full-blooded brothers: Lysimachus and Philip. His father Lysimachus, one of the Diadochi of Alexander the Great, was King of Thrace, Asia Minor and Macedonia. His paternal grandfather was Agathocles of Pella, a nobleman who was a contemporary to King Philip II of Macedon and his paternal grandmother was an unnamed woman perhaps named Arsinoe. From his father's previous marriages and from an Odrysian concubine, Ptolemy had two older paternal half-brothers: Agathocles, Alexander and two older paternal half-sisters: Eurydice, Arsinoe I and perhaps another unnamed sister who may have 
Title: Ptolemy V Epiphanes
Content:  Between 206 and 205 BC, Ptolemy IV lost control of Upper Egypt to the self-styled pharaoh Hugronaphor. Ptolemy V was born in 210 BC, possibly on 9 October. He was made co-regent with his father shortly thereafter, probably on 30 November. In July or August of 204 BC, when Ptolemy V was five years old, his father and mother died in mysterious circumstances. It appears that there was a fire in the palace that killed Ptolemy IV, but it is unclear whether Arsinoe III also perished in this fire or was murdered afterwards to prevent her from becoming regent.
Title: Ptolemy of Epirus
Content:  Ptolemy (Πτολεμαῖος), king of Epirus c. 237 BC – 234 ВС, was the second son of Alexander II, king of Epirus, and Olympias, grandson of the great Pyrrhus and brother of Phthia of Macedon. He was named in honour of his late uncle Ptolemy. He succeeded to the throne on the death of his elder brother, Pyrrhus II of Epirus, but reigned only a very short time, having set out on a military expedition, during the course of which he fell sick and died or, according to Polyaenus, he was treasonably assassinated. The date of his reign cannot be fixed with certainty, but as he was a contemporary of Demetrius II, king of Macedonia, it may be placed between 239 and 229 BC. He was succeeded by his niece Deidamia.
Title: Ptolemy VIII Physcon
Content:  Ptolemy was the younger son of Ptolemy V Epiphanes, who reigned from 204 to 180 BC. Ptolemy V's reign had been dominated by the Fifth Syrian War (204–198 BC), in which the Ptolemaic realm fought against the Seleucid king Antiochus III, who ruled the Near East and Asia Minor. In that war, Antiochus III had completely defeated the Ptolemaic forces, had annexed Coele-Syria and Judaea to his empire, and reduced Egypt to a subordinate position. The new situation was solidified with a peace treaty, in which Ptolemy V married Antiochus' daughter Cleopatra I in 194 BC. Ptolemy VI Philometor was the eldest son of the couple, born in 186 BC, and was the heir to the throne from birth. The exact date of Ptolemy VIII's birth is unknown, but it was probably around 184 BC. He also had an elder sister, Cleopatra II, 
Title: Epigonos of Telmessos
Content:  Epigonos was the second born son to Ptolemy I Epigone by an unnamed Greek aristocratic mother and had an older brother called Lysimachus of Telmessos. Epigonos’ father Ptolemy, was a Greek Prince who through marriage and adoption was to be the first intended heir of the Pharaoh Ptolemy II Philadelphus. Epigonos through his father, was a relation to three of the Diadochi of the Greek King Alexander the Great: Lysimachus, Ptolemy I Soter and the powerful Regent Antipater. His paternal grandfather was Thessalian Lysimachus who was King of Thrace, Asia Minor and Macedonia His paternal grandmother was Arsinoe II, a Ptolemaic Greek Macedonian Princess who married his paternal grandmother as his third wife who later married her full-blooded brother Ptolemy II Philadelphus as her third husband and through marriage became Queen of the Ptolemaic Kingdom. Arsinoe II was a daughter born to Ptolemy I Soter and Berenice I of Egypt. Ptolemy I was the founder of the Ptolemaic dynasty of Ancient Egypt and Berenice I was the great-niece of the powerful Regent Antipater, through her maternal grandfather Cassander, the brother of Antipater.

Question: Who is the father of Ptolemy V Epiphanes?
Answer: Ptolemy IV Philopator.