First of all, the average age of a family of five in Xiao Xiong is 5 1 year, which means that the total age of the whole family is 5 1 * 5 = 255 years old. Then look at what my grandfather said, "The average age of the three of us is 65", which means that my grandfather's age+my grandmother's age+my father's age =65*3= 195. Then, look at what my mother said, "The average age of the three of us is 36", that is to say, my mother's age+my father's age+Xiao Xiong's age =36*3= 108. Finally, use (grandpa's age+grandma's age+dad's age)+(mom's age+dad's age+Xiao Xiong's age)-(grandpa's age+grandma's age+mom's age+Xiao Xiong's age) = 195+ 108-255 to calculate dad's age.

Course: 5 1*5=255 (years old)

65*3= 195 (years old)

36*3= 108 (years old)

195+ 108-255=48 (years old)

Pure hand tour, please adopt ~