Here we see the beeginning of fued that lasted for ages. We learn several valuable lessons from this off the wall encounter from this set of twins: 

1. People will use your weaknesses to get what they want even when they are closest to you

2. When God has prophesied a thing it doesn't matter what circumstances there are, he is going to make room for what he has promised.

3. God doesn't need your help. Even when you try to tip the scales, he is still going to do what he wants