except that nothing in this title shall require an employer to provide paid sick leave or paid medical leave in any situation in which such employer would not normally provide any such paid leave. If the employee elects or the employer requires the substitution of accrued paid leave for leave provided under subsection (a)(6)(A), the employer shall not restrict or limit this substitution or impose any additional terms and conditions on such leave that are more stringent on the employee than the terms and conditions set forth in this Act. . (d) Notice Section 102(e) of such Act ( 29 U.S.C. 2612(e) ) is amended by adding at the end the following new paragraph: (4) Notice relating to parental involvement In any case in which an employee requests leave under paragraph (6) of subsection (a), the employee shall provide the employer with not less than 7 days’ notice or as much notice as is practicable before the date the leave is to be taken, of the employee’s intention to take leave under such paragraph. . (e) Certification Section 103 of such Act ( 29 U.S.C. 2613 ) is amended by adding at the end the following new subsection: (g) Certification related to parental involvement An employer may require that a request for leave under section 102(a)(6) be supported by a certification issued at such time and in such manner as the Secretary may by regulation prescribe. . (f) Definition of grandchild Section 101 of the Family and Medical Leave Act of 1993 ( 29 U.S.C. 2611 ) is amended by adding at the end the following new paragraph: (20) Grandchild The term grandchild means a son or daughter of an employee’s son or daughter. . 3. Entitlement of Federal employees to leave for parental involvement (a) Leave requirement Section 6382(a) of title 5, United States Code, is amended by adding at the end the following new paragraph: (5) (A) Subject to subparagraph (B)(i) and section 6383(f), an employee shall be entitled to leave under this paragraph to participate in or attend a school conference or an activity that is sponsored by a