When a twin dies before birth, the sole survivor needs help and understanding. Womb twin survivors are the sole survivors of a twin or multiple pregnancy. This group, 1 in 10 of the population, includes survivors of a stillbirth, miscarriage, abortion and a "vanishing twin" pregnancy. It is a story of a twin bond broken by death, leaving a lonely survivor.
Here is a rather old TV programme that deal with the idea of left handedness and the connection to dyslexia
There is a theory that left handed people are womb twin survivors. They are the sole survivors of "mirror" twinning.
The idea is that monozygotic twins are one zygote split into two, and it can happen that the twins are mirror images of one another. If the righthanded one is the one to die, then the left handed one will be the sole survivor.