U.S. President Barack Obama is poised to give relief from deportation to millions of undocumented immigrants who are parents of U.S. citizens or of permanent legal residents, according to a source familiar with White House deliberations. Obama has promised to lay out the details of an executive order on immigration. The action could come as early as this week. The source, who asked not to be identified, said some details were not yet available on which parents of citizens or permanent residents would be included. The Obama administration, the source said, had been looking at options including those parents who...