If the mass of your father is 70kg, what is his weight (N) ?

686.7 N

Step-by-step explanation:

mass the person is 70 kg, which is constant for the entire universe. Although weight of the person is depends upon the gravity of the planet on which he resides

W = mg

m = mass W = wight and g = Acceleration due to gravity of the planet which 9.81 m/sec^2 on earth.

therefore weight W = 70*9.81 = 686.7 N

Hence the weight of the father will be 686.7 N