God's promise and inheritance

1 Kings 15:1-8
Jeroboam son of Nebat, Abijah became king of Judah, and he reigned in Jerusalem three years.
He committed all the sins his father had done before him; his heart was not fully devoted to the Lord his God. Nevertheless, for David's sake the Lord his God gave him a lamp in Jerusalem by raising up a son to succeed him and by making Jerusalem strong.
The writer of Kings defines a good king as one who promotes the worship of God; a bad king as one who strays(流浪) into idolatrous practices. One this definition, Abijam's three-year reign is a bad one.
Why?
Abijah reigned in Jerusalem only three years for he committed all the sins, but God raising up a good son to succeed him and making Jerusalem strong. Because God remember David had done for the Lord, so God gave him a lamp in Jerusalem.
Can I have a good son or daughter to succeed me and devote my life to the Lord?
What can I do to devote more the Lord? Preparing myself and focusing to the Lord and follow God's word.
How?
Let me be a good witness before my family!