No, not everyone is born with a twin.
only twins have the same genes (all twins)
If there are two twins, the answer is 2 If there are two sets of twins the aswer is 4
twins'. Since twins are 2 people, it will be twins'.
Yes, it is a plural noun. Twin people or animals are all nouns.
It depends on the people. Typically, there is a 'connection,' but not all twins have this.
All twins are meant to be good.
People who have had twins stand a better chance "statisticaly" of having twin again then those that did not have twins.
Two twins are two people. Twins are siblings born at the same time, sharing the same age and often a strong physical resemblance.
No.
No
yes
No they are not twins Joe is the oldest out of all of them.