No, they were not related. See also:
II Chron 11:21 Rehoboam
It was not Solomon's son, but David's son, by Bathsheba, that died (and was never mentioned by name in the Bible).(2 Samuel 12:15-18)
Solomon, not David, had a son Rehoboam, who had a son named Abijam. this is in 1 Kings 14:31.
2 Chronicles 11:21:21And Rehoboam loved Maachah the daughter of Absalom above all his wives and his concubines: (for he took eighteen wives, and threescore concubines; and begat twenty and eight sons, and threescore daughters.)That would be 88 children.
A:Abijam, or Abijah, was the son and successor to Rehoboam as king of Judah.
A:According to the Bible, Rehoboam was succeeded by Abijah, who ruled Judah for two years. Some scholars believe that both Rehoboam and Abijah might have been purely legendary, as they say Judah probably did not have kings at such an early stage in its history.
Rehav'am (Rehoboam).
Rehoboam
Jeroboam
Nadab was king of Israel after Jeroboam I.
The word "son" appears 144 times in the Book of Proverbs in the Bible.
Rehoboam was one of his sons.