Sure a 5 year old doesn't have the vocabulary and mental fortitude to understand or explain the concept.

But if you have a child, you raise them for 5 years, I assume you care about them. You can explain "Can you help mommy set the table?" or "Can you pass daddy the plates?"

You don't need to explain the process of your work and the commute and other things. But if you just explained things to your children, they'll understand. When my parents did, I got to understood the task and why they wanted it. When my mother or my boss barked orders without any understanding why or how, I was left more confused.

And trust me, I worked retail, most people are fine, some people are real pieces of work. I still have some horror stories of customers, some frequent, some once or twice. But what got me out of every single one, was talking it out. From a dude who had literally half of his skull and brain missing, to my co-workers, to the average customer I forgot by the end of my shift.

I don't understand what you are implying here. How does her lack of communication skills determine having children? Let alone specifically with her husband?