Having a disabled child may mean your estate plans differ from that of other parents. For the parents of disabled children, estate planning is important. Experts note that one of the biggest mistake parents make is waiting to long to set up necessary trusts for their child to transition into adulthood, as seamlessly as possible. It may be hard to think about, but select a guardian. A guardian is necessary if your child either has not reached the age of majority, or may require assistance / lack the skills to live independently.