Question: Who was the father of Abijam, the fourth king of the House of David and the second of the Kingdom of Judah?

Context paragraphs:
Kings of Judah: The Kings of Judah were the monarchs who ruled over the ancient Kingdom of Judah.  According to the biblical account, this kingdom was founded after the death of Saul, when the Tribe of Judah elevated David to rule over it.  After seven years, David became king of a reunited Kingdom of Israel.  However, in about 930 BC the united kingdom split, with ten of the twelve Tribes of Israel rejecting Solomon's son Rehoboam as their king.  The Tribes of Judah and Benjamin remained loyal to Rehoboam, and reformed the Kingdom of Judah, while the other entity continuing to be called the Kingdom of Israel, or just Israel.

Abijah of Judah: Abijam was, according to the Hebrew Bible, the fourth king of the House of David and the second of the Kingdom of Judah.  He was the son of Rehoboam and the grandson of Solomon.  The Chronicler refers to him as Abijah.

Solomon: Solomon ( ; "Šlomo"; Syriac: ܫܠܝܡܘܢ‎ "Shlemun"; Arabic: سُليمان‎ ‎ "Sulaymān ", also colloquially: "Silimān " or "Slemān "; Greek: Σολομών "Solomōn"; Latin: "Salomon" ), also called Jedidiah (Hebrew ), was, according to the Hebrew Bible (Book of Kings: 1 Kings 1–11; Book of Chronicles: 1 Chronicles 28–29, 2 Chronicles 1–9), Quran, hadith and "Hidden Words", a fabulously wealthy and wise king of Israel who succeeded his father, King David, the previous king of Israel.  The conventional dates of Solomon's reign are circa 970 to 931 BCE, normally given in alignment with the dates of David's reign.  He is described as the third king of the United Monarchy, which would break apart into the northern Kingdom of Israel and the southern Kingdom of Judah shortly after his death.  Following the split, his patrilineal descendants ruled over Judah alone.

Isaac b. Judah: R. Isaac son of Rab Judah (or Isaac b. Judah or YIẒḤAḲ BAR JUDAH, Hebrew: רב יצחק בריה דרב יהודה) was a fourth generation Amora sage of Babylon.  His father was Judah ben Ezekiel who was his Teacher par excellence, and he debated many Halakhaic issues with him.  His father regarded him highly, and would submit statements in his son's name, which was considered unusual, since usually an Amora does not submit statements in the name of their students (but rather, the other way around).  At times he would commentate on his father's work.

Davidic line: The Davidic line (also referred to as the House of David) (known in Hebrew as Malkhut Beit David (מלכות בית דוד) – "Kingdom of the House of David") refers to the tracing of lineage to King David referred to many times in the Hebrew Bible and in the New Testament.

Battle of Zephath: The Battle of Zephath, according to the Bible, occurred during the dates of 911-870 BCE, in the reign of King Asa of Judah.  It was fought at the Valley of Zephath near Maresha in what is now Israel, between the armies of the Kingdom of Judah under the command of King Asa and that of the Kushites and ancient Egyptians under the command of Zerah the Ethiopian who, given the time frame with Asa's reign, may either be Pharaoh Osorkon II or Osorkon I.  The warriors of Judah were victorious in the battle after utterly defeating the Egyptians and Kushites, by divine intervention as written in the Bible and Asa's forces collected a large volume of war spoils.  Asa's forces pursued the enemy stragglers as far as the coastal city of Gerar, where they halted due to exhaustion.  The result of the battle created peace between Judah and Egypt until the time of Josiah some centuries later, when the latter would again make encroachments in the region.

Mahathammaracha I: Mahathammaracha I (Thai: มหาธรรมราชาที่ ๑ ), born as Lithai (Thai: ลิไทย ), was a king of the Sukhothai kingdom, reigning from roughly 1347 until his death in 1368.  Lithai was the son of Lerthai, also known as Loethai or LeLue Thai, and the grandson of Ramkhamhaeng.  The exact chronology of Lithai's rise to the throne is unclear.  Popular tradition names him as the fourth king of Sukhothai, but dynastic records seem to indicate that at least one other king (Nguanamthom) ruled between Lithai and his father, as well as the regent Phaya Sai Songkhram who ruled during Lerthai's absence following the death of Ram Khamhaeng the Great.

Neferkare Neby: Neferkare Neby (also Neferkare III) was an ancient Egyptian pharaoh of the Eighth Dynasty during the early First Intermediate Period (2181–2055 BC).  According to egyptologists Jürgen von Beckerath and Darell Baker, he was the fourth king of the seventh dynasty, as he appears as the fourth king in the Abydos King List within the list of kings assigned to this dynasty.

Singu Min: Singu Min (Burmese: စဉ့်ကူးမင်း , ] ; 10 May 1756 – 14 February 1782) was the fourth king of the Konbaung dynasty of Myanmar.  The king, who came to power amid controversy, largely put an end to his father Hsinbyushin's policy of territorial expansion, which had severely depleted the kingdom's manpower and resources.  He stopped his father's latest war against Siam at his accession, effectively ceding Lan Na to the Siamese.  Likewise, he took no action when the Laotian states stopped paying tribute in 1778.  The only campaigns were in Manipur, where the Burmese army was forced to put down four rebellions throughout his reign.

Jeroboam's Revolt: Jeroboam's Revolt () was an armed insurrection against Rehoboam, king of the United Monarchy of Israel, and subsequently the Kingdom of Judah, lead by Jeroboam in the late 10th century BCE, as described by the First Book of Kings and the Second Book of Chronicles of the Hebrew Bible.  The conflict, referring to the independence of the Kingdom of Samaria and the subsequent civil war during Jeroboam's rule, began shortly after the death of Solomon and lasted until the Battle of Mount Zemaraim.  The conflict began due to conflict under the rule of Solomon's successor, his son Rehoboam, and was waged with the goal of breaking away from the United Monarchy of Israel.  Though this goal was achieved very early on in the conflict, the war continued throughout the duration of Rehoboam's reign and well into the reign of his son, Abijam, who defeated the armies of Jeroboam but failed to reunite the kingdoms.

Supporting paragraphs: Abijah of Judah Davidic line
Answer: Rehoboam