Title: Ptolemy II Philadelphus
Content:  Ptolemy II was the son of Ptolemy I and his third wife Berenice I. He was born on the island of Kos in 309/308 BC, during his father's invasion of the Aegean in the Fourth Diadoch War. He had two full sisters, Arsinoe II and Philotera. Ptolemy was educated by a number of the most distinguished intellectuals of the age, including Philitas of Cos and Strato of Lampsacus. Ptolemy II had numerous half-siblings. Two of his father's sons by his previous marriage to Eurydice, Ptolemy Keraunos and Meleager, became kings of Macedonia. The children by his mother Berenice's first marriage to Philip included Magas of Cyrene and Antigone, the wife of Pyrrhus of Epirus. At Ptolemy II's birth, his 
Title: Ptolemy Philadelphus (son of Cleopatra)
Content:  Ptolemy XVI Philadelphus Antonius (Πτολεμαῖος ὁ Φιλάδελφος, "Ptolemy the brother-loving", August/September 36 BC – 29 BC) was a Ptolemaic prince and was the youngest and fourth child of Greek Ptolemaic Queen Cleopatra VII of Egypt, and her third with Roman Triumvir Mark Antony.
Title: Ptolemy II Philadelphus
Content:  Ptolemy II Philadelphus ( Ptolemaios Philadelphos, "Ptolemy, sibling-lover"; 309 – 28 January 246 BC), also known posthumously as Ptolemy the Great, was the pharaoh of Ptolemaic Egypt from 283 to 246 BC. He was the son of Ptolemy I, the Macedonian Greek general of Alexander the Great who founded the Ptolemaic Kingdom after the death of Alexander, and Queen Berenice I, originally from Macedon in northern Greece. During Ptolemy II's reign, the material and literary splendour of the Alexandrian court was at its height. He promoted the Museum and Library of Alexandria. In addition to Egypt, Ptolemy's empire encompassed much of 
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 II Philadelphus
Content:  Ptolemy married Arsinoe I, daughter of Lysimachus, between 284 and 281 BC. She was the mother of his legitimate children: Ptolemy II repudiated Arsinoe I in the 270s BC. Probably in 273 BC, he married his sister Arsinoe II, widow of Lysimachus. They had no offspring, but in the 260s BC, the children of Ptolemy II and Arsinoe I were legally declared to be Arsinoe II's children. Ptolemy II also had several concubines and mistresses, including Agathoclea (?), Aglais (?) daughter of Megacles, the cup-bearer Cleino, Didyme, the Chian harp player Glauce, the flautist Mnesis, the actress Myrtion, the flautist Pothine and Stratonice. With a woman named Bilistiche he is said to have had an illegitimate son named Ptolemy Andromachou.
Title: Ptolemy Philadelphus (son of Cleopatra)
Content:  Ptolemy XVI Philadelphos Antonius was of Greek and Roman heritage. His father Mark Antony summoned Cleopatra to a summit near Antioch, Syria (now a part of modern Turkey) in a place Plutarch locates as being situated between Beirut and Sidon, called Light, an unwalled village. If Plutarch is to be believed, Philadelphos was conceived during this meeting between roughly November and December 37 BC. Tarn believed his birth (presumably in Alexandria, Egypt) was between August–September 36 BC. Ptolemy XVI was named after the original Ptolemy II Philadelphus (the second Pharaoh of the Ptolemaic dynasty) and Cleopatra's intention was recreating the former Ptolemaic Kingdom, which she herself received from Antony in the Donations 
Title: Ptolemy Philadelphus (son of Cleopatra)
Content:  Antioch in 36 BC at this time with full approval from Octavian. Two years later in late 34 BC, at the Donations of Alexandria, part of her kingdom was granted to Ptolemy making him ruler of Syria, Phoenicia and Cilicia. Having approved of Antony's planned reorganization of the East in 36 BC, by 34 BC their political situations had evolved and Octavian then used with potency the Donations of Alexandria in his propaganda war against Antony. Ultimately, the parents of Philadelphos were defeated by Caesar Octavian (future Emperor Augustus) during the naval battle at Actium, Greece in 31 BC. The next year, his parents committed suicide as Octavian's legions invaded Egypt.
Title: Ptolemy (son of Pyrrhus)
Content:  Ptolemy (295–272 BC) was the oldest son of king Pyrrhus of Epirus and his first wife Antigone, who probably died in childbirth. He was named in honour of his mother's stepfather, king Ptolemy I Soter of Egypt, who was a benefactor to Pyrrhus in his youth. When Pyrrhus returned from Italy in 274 BC Ptolemy captured the island of Corcyra for his father in an audacious attack with only 60 men. He also distinguished himself in a naval battle, and during the following invasion of Macedonia he dislodged king Antigonus II Gonatas from Thessalonike. In 272 BC Ptolemy accompanied his father on a military campaign in the Peloponnese, where he commanded his personal guard. During the retreat from Sparta he was attacked by a Lacedaemonian force under Eualcus and slain by the Cretan Oroissus of Aptera. His father avenged his death killing Eualcus, but fell a few days later in the streets of Argos. Ptolemy had an older sister called Olympias and two younger half-brothers, Alexander and Helenus.
Title: Ptolemy I Soter
Content:  A Macedonian, Ptolemy was born in 367 BC. Ptolemy's mother was Arsinoe. According to Satyrus the Peripatetic, Arsinoe was a descendant of Alexander I of Macedon and thus a member of the Argead dynasty, claiming ultimate descent from Heracles. Ostensibly, Ptolemy's father was Lagus, a Macedonian nobleman from Eordaea, but many ancient sources claim that he was actually an illegitimate son of Philip II of Macedon. If true, this would have made Ptolemy the half-brother of Alexander. It is probable that this is a later myth fabricated to glorify the Ptolemaic dynasty. Ptolemy served with Alexander from his first campaigns, and was among the seven somatophylakes (bodyguards) of Alexander. He played a principal part in the later campaigns in Afghanistan and India. He participated in the Battle of Issus, commanding troops on the left wing under the authority of Parmenion. Later he accompanied Alexander during his journey to the Oracle in the Siwa Oasis where he was proclaimed a son of Zeus. Ptolemy had his first independent command during the campaign against the rebel Bessus whom Ptolemy captured and handed over to Alexander for execution.
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.

Question: Who is the father of Ptolemy II Philadelphus?
Answer: Ptolemy I Soter.
Ptolemy son of Lagus.