Although some ideas for explaining, showing and practicing require multiple children, most can be done with mom taking one role and the child the other. The game “Love is…” might need to be held for when the cousins come over, but most other ideas can be adjusted to fit an only child.
Instead of mom guiding from the outside, mom will have to be an active part. Even with four children, I would often play one part in a role play. If we were practicing how to greet someone, I would be the adult and the child would practice with me, while the other children watched. Sometimes, I would ask the observers how the child had done to keep them involved.
If a crowd is part of an example you are trying to explain, show and practice, then pull in some chairs to be “the neighbors”. If the extras are just bystanders, then anything can be used to represent them. An only child has to have a great imagination, as he is often required to play by himself. We can use this gift of imagination to fill in any gaps in our role playing.
Parents of one child often have play dates to allow their child interaction with peers. These play dates could include some ESP too. Take advantage of other children being over and explain, show and practice with them. Perhaps you want to do a full Bible time; otherwise, character training could go on under the disguise of another game.
When our children were small, I would often ask friends over with the invitation to join us for Bible time and lunch. It wasn’t awkward; instead it gave some order to our time together.
Whether you have one child or one dozen children, ESP can be used to train them in the character God requires of all of us.