should i report them?

I just found out a friend of mine is married to a woman that has a son almost 15 and they have a son that is 10.they just found out that the 15 year old has been sexualty abusing the 10 year old for 2 years(his half brother)so at the time it started he would have been about 13 1/2 and the other about 8 the parents think they are just kids doing what kids do.I say diffrent.is there a law that would protect the younger boy?
I think i posted this in wrong placeat first.

[SL345]

What exactly do you mean by "sexually abusing?" Laws vary from state to state. If there is a five year age difference, and/or the younger child is incapacitated in any way (by force, coercion, or physical/mental limitations), it's almost certainly illegal. Child Protective Services might also accept the case if the parents have knowledge and haven't acted to protect the younger one and get help for both. In some jurisdictions, the police will turn cases away if there is no complaintant (i.e., someone who'd give a statement and press charges), but that's not always true. CPS should investigate in most states if it is stated that the parents have been neglectful in some way.

[snot]

They are in the Mil.and over seasand from what i understand there was anal pen.and oral thats about all i know.thank you.Snot

[SL345]

You can report it to the base commander.

[amish1979]

Report it now!

[indigo39]

That is not just 'kids being kids'. That is abuse and it needs to be reported. I would guess that the 15-year old was probably molested himself to be doing that to his 8-year old brother...

[sixstarrs]

POOR BOY!  You should report it to the child welfare people in your area.  that's awful.  even if they are in the military, child protective services can com ein, i think.  they do investigations and then figure out whether to remove the child from the home and how to rehab them and get them help.