Thank you for the opportunity to help you with your question!
Having dimples is a dominant gene. It depends on the mom and dad's geneotypes. If the Mom is Dd and the father is Dd then there is a 25% chance that the children will not have dimples, but if either the mom or dad has DD as their geneotype then there is no way for the children not to have dimples.
Please let me know if you need any clarification. I'm always happy to answer your questions.