The average age of a family having five members is 42 years and the age of the oldest member of the family is 76 years. In the same year, a member whose age is 32 years has married a girl whose age is 30 years and after marriage, the average age of the family (including the bride) is reduced by 2 years. If the ratio of the age of the rest of three members (Other than the oldest member, the bride, and the groom) is 5 : 14 : 15, respectively then find the difference between the age of the oldest member and the age of the youngest member?