Illinois has eliminated the use of the word ‘custody’ and has replaced by the term ‘Allocation of parental responsibility’ but the substance remains the same. In the State of Illinois, ‘Legal Custody’ means having the right to make parenting decisions, regarding the education and medical care of your child after a divorce. Legal custody in Illinois can also mean sole or joint custody. In the case of sole custody, you will have the right to make important decisions on behalf of your child until they turn the legal age of 18. In the circumstance of joint custody, all decisions that involve your children must be shared according to the court.