But in the future, the growth value of the sum of parents' ages is twice that of Xiao Ming (less than the multiple of 8). Therefore, with the growth of age, the multiple of the age of mom and dad and Xiaoming will gradually decrease, reaching 6 times one year.
Can be carried out by experiment:
Four years later, the age of mom and dad is 37+35+8=80, which is more than 7 times that of Xiao Ming (8+4= 12), close to but greater than the answer value (6 times).
Eight years later, the age of mom and dad is 37+35+ 16=88, which is less than 5 times of Xiaoming's age (8+8= 16) and close to but less than the answer value (6 times).
This time, you can set the middle value of the last two values. Six years later, the age of mom and dad is 37+35+ 12=84, which is six times that of Xiao Ming (8+6= 14), just in line with the meaning of the question.
So six years later, mom and dad are six times as old as Xiao Ming.