From what I have been told twins are hereditary through the female line.
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No, suicide may not be hereditary, but depression can be, which could be the cause as to why your relative may have lost their life.
Ferternal twins don't look alike, but twins do
The fact that twins run in families is actually a myth. The odds of twins having twins is the same as a non-twin having twins. That is about 1 in 33.
Mirror Twins are always monozygote twins. This does not mean that fraternal twins won't be a righty and a lefty - if your family tends to run left handed.
Fraternal twins are more popular.