Luck must get on your side. Identical twins don't run in families and may happen for any couple with any pregnancy. Non-identical twins are influenced by genetics; women whose mothers or grandmothers had non-identical twins do have more chance of getting non-identical twins themselves. however identical twins are simply random.
Some families do seem to have a higher than average number of identical twins. although this may solely be contributed to luck, coincidence and probability instead of any familial genetic tendency.
The odds of getting twins are way greater than for the other type of multiple births. Around ninetieth of all multiples are created up of twins; the remaining 100 percent is with triplets, quadruplets and very occasionally quintuplets and more. In recent years there has been an enormous increase within the numbers of twins being born.