Question: What sister of a longtime Senator from Massachusetts married Peter Lawford?
Sentence (from "Patrick Kennedy (1823–1858)"): He was the father of businessman/politician P. J. Kennedy, paternal grandfather of businessman/politician Joseph P. Kennedy Sr., and patrilineal great-grandfather of World War II casualty Joseph P. Kennedy Jr., President John F. Kennedy, Senator Robert F. Kennedy, and longtime Senator Ted Kennedy.
Relevant evidence: No