The Test

A mother in law decided to take a test to ascertain as to who among her three son's in law love her much.... so on the 1st day she jumped into a pond and the eldest son in law too jumped in to the pond immediately and saved her.Being very satisfied,she presented  him a car
  2nd day ,she again did the same thing and the 2nd son in law also saved her by jumping in to the pond.And she being very satisfied presented a bike to him
On the 3rd day the same drama was enacted by the mother in law.But the youngest son in law did not jump in to the pond thinking that he would be getting only a bicycle which would not commensurate  his labour and the mother in law expired being drowned. ....
Next day the youngest son in law was presented with a BMW car  but who gave it????????????
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His father in law..