There has been limited prior research on men imprisoned for family harm. The goal of the present study was to examine whether family harm offenders differed based on their lead offence type (violence, breach of protection order, and sexual) in terms of their adaptation to incarceration in New Zealand. Specifically, we wanted to see if those with breach of protection orders engaged in more prison incidents and misconducts (and earlier in their sentence) than those with a violence or sexual offence. We also planned to examine if results were similar for Māori and non-Māori. Our sample included men who were incarcerated between 2016 and 2020 for a family harm offence (N = 7,561) and we analysed administrative data provided by Ara Poutama Department of Corrections (COBRA). Men with sexual offences were significantly older, with fewer prior convictions and lower static risk (RoCRoI), were less likely to be gang members and had longer prison sentences. Men with breach offences had higher static risk and were older than those with violent offences. Survival analyses showed that violent and breach offenders had significantly greater incident rates than sexual offenders, and time to incidents was consistently lowest for breach offenders. Cox regression analyses (which included age, RoCRoI score, gang affiliation, and previous conviction count as covariates) showed that Māori breach offenders had significantly lower incident rates (all incidents, violent perpetrator, violent victim, and self-harm) compared to Māori violence offenders, whereas incident rates were similar for non-Māori breach and violent offenders. Although time to incidents was shortest for breach offenders, as predicted, the lower incident rates for breach compared to violence offenders for Māori was unexpected and could be investigated in future research. Overall, results of this study show men with breach, violence, or sexual family harm offences differ in their adaptation to incarceration as shown by incident rates, which could help to inform policy for managing these men while in prison.