YouTube star Ms. Rachel shared in an interview with Today.com that her son Thomas, 7, has been a great help with his baby sister Susannah, changing diapers and feeding her. Susannah, born via surrogacy, is a happy baby who enjoys watching her mother's YouTube content. The family recently released a potty training video on YouTube, featuring Broadway friends and music to make the process fun and engaging. The episode, filmed in January, is now available for viewing.