Is it wrong to date your second cousin?
In the United States, second cousins are legally allowed to marry in every state. However, marriage between first cousins is legal in only about half of the American states. All in all, marrying your cousin or half-sibling will largely depend on the laws where you live and personal and/or cultural beliefs.
Is it OK to marry second cousin?
Since relatives share some of their genes by common descent, consanguineous marriage influences the incidence of some inherited disease. The genetic influence in marriages between couples related beyond second cousins differs only slightly from that observed in the general population.