def add_grandparents(pgf,pgm,mgf,mgm)
      transaction do
        add_paternal_grandparents(pgf,pgm)
        add_maternal_grandparents(mgf,mgm)
      end
    end
def add_grandparents(pgf,pgm,mgf,mgm)
      transaction do
        add_paternal_grandparents(pgf,pgm)
        add_maternal_grandparents(mgf,mgm)
      end
    end
add all grandparents calling #add_paternal_grandparents and #add_maternal_grandparents in a transaction
 @param [Object] pgf paternal grandfather
 @param [Object] pgm paternal grandmother
 @param [Object] mgf maternal grandfather
 @param [Object] mgm maternal grandmother
 @see #add_paternal_grandparents
 @see #add_maternal_grandparents
 @return [Boolean]