Twin are only those who are born at the same time, or almost the same time. Childern born 9 months apart aren't twins, they are siblings.
Yes babies can be called twins. Also when they grow up they"ll still be called twins.
If they are human twins then about 9 months
Conjoined twins. The older terminology was Siamese twins, after the first recorded twins in the country of Siam (now called Thailand).
siblings
Cleopatra's twins were called Alexander Helios and Cleopatra Selene.
A set of seven twins is called septuplets.
Neptune and uranus are called twins. The Earth and Venus are called twins because of the similarity in size. See the related link for more information. The Earth and mars are not considered twins.
the twins were thomson and thopson.
If they were not then they would not be called identical twins!
How do fraternal twins form? Answer one egg from each ovary is fertilized.
Identical twins are called monozygotic. Fraternal twins are called dizygotic.