The inquest has opened into the death of Ben Cowburn in Cornwall. Ben was 18 when he was found dead at a mental health unit for adults in Cornwall, a few days before Christmas 2010.
Since his death his parents, Steve and Sharon Cowburn, have set up a charity to campaign for a unit to deal with young people who have mental health problems.
At present anyone under 18 has to treated outside Cornwall.
The inquest is being held over nine days at a former convent in Truro and is expected to hear from 27 witnesses.