The legal definition of incest can vary from state-to-state. The one I am familiar with forbids sexual relations within the 3rd degree of consanguinity (that would be no closer than your third cousin).
If you're in the US - it depends on the state you're in and the nature of the relationship. If the relationship is sexual, then yes, it would probably be illegal.
Essentially because it is construed as a betrayal of the relationship (see in loco parentis) and manipulation under color of authority.
no it is not illegal
If u mean when was it formed, it was formed when a bunch of incestuous retards decided to rebel against their own ancestors (Around about 1775 - 1783)
90
The US is not an illegal trading country..
one half
It is not legal to work in this country if you do not have a green card and you are an illegal.
The names of the first illegal aliens in the United States are not known. There are millions of illegal immigrants that are in the US, as of 2014.
There are a lot of drugs in the US. Count how many sewage pipes are in the US. That's how many illegal drugs are in the US.
If they obtain a visa, they are not illegal.
No its not illegal to sing..its illegal to fish on a horse