PARENT/GUARDIAN INCLUSION CRITERIA:  18 years or older Fluent in English Owns an Android or iPhone-based smartphone with a data plan and is the primary user of the phone Primary caregiver and supervisor of a youth aged 15-21 on probation or receiving post-incarceration reentry services at time of screening  YOUTH INCLUSION CRITERIA:  Age 15-21 years Fluent in English Possesses and is the primary user of an Android or iPhone-based smartphone with a data plan Currently resides in same household as linked parent/legal guardian at least 5 days per week Has been arrested at least once and is receiving community-based JJ services related to probation or re-entry At significant risk for suicide, as evidenced by one of the following: one or more lifetime suicide attempts; elevated past-month suicidal ideation (>24 on the SIQ-JR99, or self-injury repetition (>3 lifetime self-harm episodes, including one in the past 12 weeks before screening) Willing to disclose NSSI and suicidal behaviors to parent  To ensure consistency of planned and actual enrollment, particularly of Black youth, we will begin to exclude youth of certain races once we have achieved our pre-established recruitment milestone for a specific racial group.