From the article:
A new study, published in Nature Neuroscience, has shown that traumatic experiences early in the life of mice alters the expression of small RNAs in the sperm. The depressive behaviors seen in the father are also present in the offspring, persisting for several generations.

In recent years it has become apparent that it is not only our DNA that contributes to heritability; environmental factors evidently also play a role. Observations that individuals who have experienced trauma often have children that also display particular behavioral traits, such as depression and anxiety, led researchers to believe that there may be more to the story than purely social explanations. Of course, individuals that have experienced trauma may behave differently toward their children which could provide some explanation for the apparent effects, but it is evident that stress can also affect epigenetics. Epigenetics refers to alterations in the expression of genes which are not due to changes in the sequence itself

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Stress Affects Sperm RNA In Mice | I ****ing Love Science

Kind of interesting.