Brother: Girl: Father:: 1: 2: 4
=> x+2x+4x = 7x
Brother and father => 5x
After 22 years
Brother: Father:: 1: 2 = > 3(x+22)
Now we can continue by knowing
5x - 3(x+22) = -44 [ because between the 2 ratios the age difference is 22x2 for 2 people ]
5x - 3x -66 = -44
2x = 22
x = 11 ===> Brothers age 22 years earlier, so now ===> 11 + 22 = 33.
2x = 22 ===> Sisters age 22 years earlier, so now ===> 22 + 22 = 44.
4x = 44 ===> Fathers age 22 years earlier, so now ===> 44 + 22 = 66.