Antibody deficiencies, also called immunoglobulin deficiency syndromes, are immune system disorders that are characterized by low or absent levels of immunoglobulin in the blood. Immunoglobulins (Ig) are antibodies that play an essential role in the body's immune system.
Tamaranann1: In every state legally when a child turns 18, a parent is no longer financially responsible for the child. Morally, we are all responsible for our children's well being and support. ;0)
However, the attoney told me that for children who are  12 and older, if they refuse to go to a visit, or refuse to see the  parent when they came to pick them up, the custodial Parent is not  breaking any law as long as the child was made available for the  visit.