Jehoram completely walked away from God after starting well. His father was a good king till the end, as opposed to how he ended. The major reason for his going far away from God was because of who he married(Jezebel's daughter)The marriage made him embrace Baal worship and made him commit atrocities like even killing all his brothers. The person we marry will either draw us closer to God or pull us away from Him. Jehoram had a godly heritage, but one wrong marriage brought idolatry, bloodshed, and destruction, so also for us today let's seek God when it comes to making the choice of marriage cos a wrong spouse doesn’t just affect one but can affects your children, your home, and your entire generation