Sisterly love amidst leukemia treatment. My 4 year old daughter (now 5) was diagnosed with Acute Lymphoblastic Leukemia in February 2017, 1 week after her baby sister was born, and 2 weeks before her 5th birthday. They have 2 young brothers also, but the bond between these two is very strong as baby sister has been with her in and out of the hospital since birth. It has been rough on the family, but baby sister has brought many smiles to big sisters face when smiling was the last thing she wanted to do.