Final answer:
The American Cancer Society (ACS) is the best referral source to assist the family in gathering more information about acute lymphocytic leukemia.
Step-by-step explanation:
The best referral source to assist the family in gathering more information about acute lymphocytic leukemia is the American Cancer Society (ACS). The American Cancer Society is a reputable organization that provides education and support to cancer patients and their families. They have resources on their website, such as informational articles, videos, and support groups, that can help the family understand the condition and navigate through the treatment process.