Well in my scenario the separation is not this extensive. I am talking about when one of them has to go out for work or even to walk the dog for 15 minutes. I g

Well in my scenario the separation is not this extensive. I am talking about when one of them has to go out for work or even to walk the dog for 15 minutes. I get your point that there is no explaining to a child that young what exactly is happening because it is beyond their comprehension. But I think conditioning them to be able to handle goodbyes knowing that the parent will be coming back soon is a good practice.