As much as our mind will work , as much as questions we will raise
I Appreciate the question which is asked by younger sister ... and i hope in future as well she will try to find answers of her questions by her own self.
I,Brother Fahad or Others may say much according to my,his or their knowledge and exprience and may be what ever we say is totly different from each other's saying regarding same and one subject due to our research or exprience but it may help you not much but little i am sure rest you have to search to get the answer.
Psychologists may say this is in nature of Man-Kind to keep them selves better or more comfortable which gives birth to Jealousy and selfishness,thats why we forget every thing when it comes to ME.
And if we consider religion we have to consider the character of idrees and the war between him and God.