Mathematical application problem solution: the age of Xiaohong's family of three is 74 years old. Eight years ago, the age of the whole family was 54. As we all know, mom is two years younger than dad. Solution: The analysis shows that the age of their whole family should be 74-8×3=50 years old eight years ago, which means Xiaohong was not born eight years ago. So now it's easy to find:

Mom: (54-2)÷2=26 years old

Dad: 26+2=28 years old.

Dad's age this year: 28+8=36.

Mom: 26+8=34 years old.

Xiaohong Age: 74-36-34=4 years old.