Why do some brothers and sisters die of old age?

It stands to reason that brothers and sisters are the closest people in the world except parents and children, and should be very close. But in reality, there are many cases where brothers and sisters die of old age. Why?

1. Brothers and sisters are independent small families differentiated from large families, with many roles such as brother-in-law, brother-in-law, aunt, and so on. Although these people have also become members of the extended family, they are relatively easy to bring conflicts with other small families because they are not related by blood.

Second, parents' preference In the past, a bowl of water was flat and planted the seeds of hatred between brothers and sisters. Once each has his own family, this hatred will erupt.

Third, in the process of sibling communication, some families care too much about gains and losses, only know how to take, don't pay, and don't think of others. In the long run, it will lead to conflicts between brothers and sisters.

Fourth, society has become mercenary, with the interests of brothers and sisters first and family second. They often fight for their parents' property interests regardless of their family ties.