Auto loans over 60 months are not the best way to finance a car. And yet, 43.5% of new-car buyers in the third quarter of 2015 took out loans of 61 to 72 months, according to Experian.
DNA Tribes is correct that siblings can and do have very diverse DNA. Your autosomal DNA is a random subset of your mother's and father's DNA (50% from each parent). Two siblings will not have the same results for the same reason that they do not look exactly the same. They do not get the exact same 50% from each parent. Even identical twins don't have exactly the same DNA (only almost exactly the same).
Here is my full sister and how much DNA I share with her as well as the number of segments that we have in common. Siblings are expected to share about 50% of their DNA --- my sister and I share slightly more than expected, just by random chance. Getting your siblings tested at 23andme is very useful because they will have DNA (and relatives along that DNA) that you do not have.