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The effectiveness of parenting interventions for parents of preschoolers with externalizing behavioral disorders has been widely documented. But it is possible that such interventions could have negative effects upon secondary aspects of parenting. Here we measure the impact on co-parenting (collaboration between the two parents) of two parenting interventions tried out in the H2M study, one aiming to improve the parent’s sense of self-efficacy, the other to improve the parent’s verbal responsiveness (N = 60). Results show the absence of any global negative effects of these interventions on the participating parent’s co-parenting. However, it seems that the development of co-parenting differs depending on the type of intervention and whether the father or mother attends it. Moreover, we discover a negative relation between co-parenting and the therapeutic alliance formed between parents and the therapists who carry out the interventions.