Ian Simpson says his son has been on a waiting list since last June and is being discriminated against because he has additional support needs.
The health board announced changes to its Child and Adolescent Mental Health Service (CAMHS) neurodevelopmental pathway on Wednesday.
Mum Karli Millan says her health visitor repeatedly assured her Kri would 'catch up'. Now they face a further delay due to NHS Tayside waiting times.
One mum says the process to get her son diagnosed with ADHD "nearly broke my family apart at times".
The Child and Adolescent Mental Health Service (CAMHS) assesses and treats children and young people with 'significant and impairing' mental health concerns.
The oldest X-ray machine still in use by NHS Tayside is 20-years-old, it has been revealed.
