The only thing illegal about "loving" someone in your family is if it is done sexually, which is what you probably mean by "as a boyfriend".
Incest is against the law in the United States. Also, if one of the parties is an adult and the other a child, there are enhanced charges involved.
In all states, close blood-relatives that fall under the incest statutes include:
Father
Mother
Grandfather
Grandmother
Brother
Sister
Aunt
Uncle
Niece
Nephew
In some states, sex between first cousins is prohibited. The cousin marriage law in the United States by state article has a table which shows that cousin sex as well as cousin marriage is outlawed in some states.
Rhode Island allows uncles to marry their nieces if they are part of a community, such as orthodox Jews, for whom such marriages are permitted. Many states also apply incest laws to non-blood relations, including stepparents, step-siblings, and in-laws.
Rhode Island allows uncles to marry their nieces if they are part of a community, such as orthodox Jews, for whom such marriages are permitted. Many states also apply incest laws to non-blood relations, including stepparents, step-siblings, and in-laws.
