Each teacher shall be allowed Compassionate Leave without loss of salary up to four days in each case of death or serious illness of any member of the immediate family of the teacher; immediate family to include, employee’s spouse, common-law spouse, child, grandparents, grandchildren, father, mother, sister, brother, son-in-law, daughter-in-law, father-in-law, and mother-in-law, brother-in-law and sister-in-law.