There is a high probability that your child’s cord blood stem cells can be used for siblings and other family members. Your child’s cord blood stem cells will be a perfect match to your child. However, it may also be very useful for other members of your family. There is a 25% chance that your child’s cord blood can be used for one of his/her siblings, and there is also a high chance that your child’s cord blood stem cells can be used for parents or grandparents.