Before I became a full time freelance journalist, I was a teacher. The principal of the school I was working in told us about this incident:
One little boy used to say “Son of a B****” while doing his arithmetic sums. His parents noticed this and contacted the principal of his school. The issue was investigated. The teacher would say “…sum of which…”. But the child had picked up “Son of a B*****”. Every day when the child’s father came home in the evening and would do his office work on his laptop, he would curse his boss, saying “Son of a B****”. Thus the problem lay within the home of the child.
You never know what and how a child picks up. It is imperative what kind of environment you give to your child. A little carelessness can lead to bad parenting results.