Section 146. Devises and bequests restricted

This article shall not be
  construed or held to authorize any devise or bequest  whatever  of  more
  than  one-half of the estate of the testator or testatrix over and above
  the payment of debts, liabilities and expenses, in case he or she  shall
  leave  a  husband,  wife,  child,  descendant,  or  parent  him  or  her
  surviving. The validity of a  devise  or  bequest  for  more  than  such
  one-half  may  be  contested  only  by a surviving husband, wife, child,
  descendant or parent.