Jehoram was thirty-two years old when he became king and he reigned eight years in Jerusalem. No one regretted his death; he was buried in the City of David, but not in the royal tombs.

 - 2 Chronicles 21:20 NET

Recall that biblical narrators creatively and rhetorically represent raw historical data to teach theology.

Waltke, Bruce K.; Charles Yu (2011-04-19). An Old Testament Theology (p. 202). Zondervan. Kindle Edition. 

They are corrupt and not his children; 

to their shame they are a warped and crooked generation.

 - Deuteronomy 32:5, NIV

When you have finished paying all the tithe of your produce in the third year, which is the year of tithing, giving it to the Levite, the sojourner, the fatherless, and the widow, so that they may eat within your towns and be filled, then you shall say before the LORD your God, "I have removed the sacred portion out of my house, and moreover, I have given it to the Levite, the sojourner, the fatherless, and the widow, according to all your commandment that you have commanded me." - Duet. 26:12-13, ESV