In Japan, about 1 million people are diagnosed with cancer each year, with 56,000 of those patients having children under 18. This study examined the concerns of cancer patients regarding their children, focusing on consultations with child life specialists (CLS) at a cancer center during 2021. A total of 138 patients, primarily women in their 40s, participated, with breast cancer being the most common diagnosis (46%). Most consultations occurred at the time of diagnosis (43%) or during primary treatment (36%). The study found that issues concerning children aged 7 to 12 were prevalent. The most frequently discussed topic was how and when to inform children about treatment details (17%). Emotional support for children was a significant concern for patients with recurrent diseases. Patients with breast cancer often sought guidance on addressing physical changes, while those with gastrointestinal and gynecological cancers focused on communication about the diagnosis. The findings emphasize the need for integrating psychosocial support into oncology care to meet the unique needs of families, particularly for school-aged children, and to provide ongoing support throughout the cancer journey.