I agree with Rarnom, this is more a question for your parents.
Ethically speaking, I would say no, personally.
Mostly because of Godchild. Don't get me wrong, I love Kaori Yuki's works, but most of the events in Godchild would probably be best suited for teenagers. Theres alot of murder, sexual situations, etc etc. Some story archs also contain mentions of incest and various other things that would probably drive a parent up a wall.
Still, I think this would best be a question for your parents or legal guardian to determine. Ask them about it, and have them buy an issue to review and come to a conclusion on.
If some of the stuff bothers them, you can always ask them about the good stuff, and perhaps get the graphic novels of whats ok for you to read.
Though, thats just my opinion.