People have jobs 
Milkman or woman,
Contractor, 
Doctor,
Writer,
You name it 
But today,
What is the most complex job to do?
Be a Parent. 
The mother has a child with the father, 
Knowing they will have to be there for their child.  
Understand their needs,
Getting them everything they need to be happy, 
Providing them with an education to learn, 
Teaching the rights and wrongs, ...