BTW, as long as we are wanting our laws on marriage to conform to what the Bible has to say about marriage, here is a gem from Deuteronomy:
21:10 When you go out to do battle with your enemies and the Lord your God allows you to prevail and you take prisoners, 21:11 if you should see among them an attractive woman whom you wish to take as a wife, 21:12 you may bring her back to your house. She must shave her head, trim her nails, 21:13 discard the clothing she was wearing when captured, and stay in your house, lamenting for her father and mother for a full month. After that you may have sexual relations with her and become her husband and she your wife. 21:14 If you are not pleased with her, then you must let her go where she pleases. You cannot in any case sell her; you must not take advantage of her, since you have already humiliated her.
And this is obviously how the laws should be amended to deal with rotten children. Also from Deuteronomy:
21:18 If a person has a stubborn, rebellious son who pays no attention to his father or mother, and they discipline him to no avail, 21:19 his father and mother must seize him and bring him to the elders at the gate of his city. 21:20 They must declare to the elders of his city, “Our son is stubborn and rebellious and pays no attention to what we say – he is a glutton and drunkard.” 21:21 Then all the men of his city must stone him to death. In this way you will purge out wickedness from among you, and all Israel will hear about it and be afraid.
And don't give me any of that "Christians aren't bound by Old Testament laws" crap, because the Christians passing these laws are damn sure taking their definition of marriage from the Old Testament. What's good for the goose is good for the gander.