Assuming that the father has a single wife makes this impossible.So let us assume that the father has 3 wives, all married at the age of 20, and are making babies until 55. That is 35 years, and if each child takes 9 months, you will get 140 total children in total. 2 wives will only make 94 babies.Therefore, adding in small rest parts, and the latter 10 years being harder to have children, the MC's father should have 3 wives.Of course, realistically speaking, they must be very rich, and very lucky to not have any premature births. So, the husband should have nine wives due to the fact that 18 months is the normal rest time before becoming pregnant again.All of this assumes that there are no twins, because a natural twin being born is around 1 / 250.