De Sylva v. Ballentine — Opinion of the Court
“ This is especially true where a statute deals with a familial relationship; there is no federal law of domestic relations, which is primarily a matter of state concern.If we look at the other persons who, under this section of the Copyright Act, are entitled to renew the copyright after the author's death, it is apparent that this is the general scheme of the statute. To decide who is the widow or widower of a deceased author, or who are his executors or next of kin, requires a reference to the law of the State which created those legal relationships. ”
