Each teacher shall be allowed compassionate leave without loss of salary up to but not exceeding four (4) days in the case of death or serious illness of any member of the immediate family of the teacher. Immediate family shall include: spouse, child, parent, brother, sister, parent in law, grandparent of the teacher or spouse, grandchild, brother-in-law, sister-in-law, son-in-law, daughter-in-law.