Suicide is now the 2nd leading cause of death among children ages 10-14 (CDC, 2022). This proposal responds to this public health crisis by testing an intergenerational mechanistic model of suicide risk in children while simultaneously testing a prevention and intervention approach that could be immediately useful. The investigators focus on children whose mothers have a history of suicidal behavior (intent, planning, attempt) as an especially vulnerable group with increased risk for an early and persistent course of suicidal thoughts and behaviors (STB). Theory and research point to emotion regulation (ER) as a potential intergenerational mechanism of suicide risk transmission from mother to child. Maternal ER affects child ER development via maternal emotion socialization, whereby maternal responses to child's emotions (validating/supportive vs. invalidating/unsupportive) shape how the child identifies, expresses, and modulates their emotions. The investigators theorize that maternal ER, a prerequisite for optimal maternal emotion socialization, serves as a clinically and etiologically significant pathway through which maternal history of suicidal behavior impacts the development of ER and emerging STB into adolescence. This proposal maximizes impact by leveraging a randomized controlled trial of Dialectical Behavior Therapy (DBT) Skills Training to improve maternal ER and testing a mechanistic model of suicide risk transmission from mothers to their children during a critical developmental juncture for the emergence and exacerbation of STB. Mothers will be randomized (1:1) to 6 months of either DBT Skills Training + Safety Planning Intervention (SPI) or SPI only. This design ensures all at-risk mothers receive SPI, an empirically supported intervention to enhance motivation, problem-solving, and mitigate suicide risk. The investigators hypothesize that mothers with a history of suicidal behavior and current ER difficulties who are randomly assigned to DBT Skills Training+SPI will experience improvements in ER compared to mothers assigned to SPI only. Furthermore, these improvements in maternal ER will predict meaningful decreases in child STB from late childhood into early adolescence through improved maternal emotion socialization and subsequent child ER development. The investigators will enroll 250 mother-child dyads with children ages 9-11 to retain a final sample of 225 dyads across two groups of mother-child dyads: (1) n=150 affected mothers (history of suicidal behavior + current ER difficulties) who will be randomly assigned to one of the two intervention conditions, and (2) n=75 nonaffected mothers (no history of suicidal behavior + no ER difficulties or psychiatric diagnosis since child's conception) to establish typical child ER development. Mother-child dyads will complete repeated multimodal assessments of ER, maternal emotion socialization, and STB over 24 months: baseline (intervention initiation), 3 months (intervention mid-point) 6 months (intervention termination), 12- and 24-months (post-intervention follow-up) when children will be ages 11-13, a high-risk time for STB. Findings from this study will identify intergenerational mechanisms of suicide risk and provide an intervention and prevention model for mitigating suicide risk in mother-child dyads.