The lower animals are our brethren. I include among them the lion and the tiger. We do not know how to live with these carnivorous beasts and poisonous reptiles because of our ignorance.
Children inherit the qualities of the parents, no less than their physical features. Environment does play an important part, but the original capital on which a child starts in life is inherited from its ancestors. I have also seen children successfully surmounting the effects of an evil inheritance. That is due to purity being an inherent attribute of the soul.
In the march towards Truth, anger, selfishness, hatred, etc., naturally give way, for otherwise Truth would be impossible to attain. A man who is swayed by passions may have good enough intentions, may be truthful in word, but he will never find the Truth.