- Long Life of mother: To have twins it is considered for mother that she may have long life because by birth of twins the skeleton structure may developed well and the potential of mother can automatically raise for her children so we can say that the life of mother can naturally increases after giving birth to twins.
- Identical male twins with identical female twins: It is considered that if identical male twins got married with identical female twins then their children will be considered as cousin but if we considered them genetically then they are siblings because of their same genes and same origins of their mothers and fathers it is strange but research shows that it happens because of their same origin.
