Ages of the father, mother and son are 50, 46 and 14 respectively.
<u>Step-by-step explanation:</u>
Step 1:
Let the age of the son be x. From given details, form equations.
Then age of father = 3x + 8
Age of mother = (3x + 8) - 4 = 3x + 4
Also, Age of mother = 18 + 2x
Step 2:
Equate the 2 equations for the age of mother.
⇒ 3x + 4 = 18 + 2x
⇒ x = 18 - 4 = 14
⇒ Age of father = 3x + 8 = 3×14 + 8 = 50
⇒ Age of mother = 3x + 4 = 46