The term 'CERTAIN RELATIVE' can be broken down into four crossword solutions: UNCLE (5 letters), INLAW (5 letters), GODSON (6 letters), and SONINLAW (8 letters). An UNCLE is a brother of one's parent, an inlaw is a relative by marriage, a godson is a male child who is the recipient of a baptismal promise from a godparent, and a soninlaw is the husband of one's daughter. All of these terms refer to relatives that are not necessarily immediate family members.