Write or wrong.
First of all, many many times the parents have an impossible task. King Chizkiyahu himself was foretold by a Novi of Hashem that his grandson will grow up wicked, and there was nothing he could do to prevent it. And he was a righteous and caring powerful king. The grandson? King Menashe!
You could drop a hint that he can come with his friends for Friday night.
Do you love Yiddishkeit? How do you express it? Are you happy?
This is a tough one, but try and give him direction in life without preaching.
Important; Make the home and the Shabbos table a happy and fun place to be.
Please be moichel me if I have offended you.
If you comment I will attempt to reply.