Mobile devices are present in people s lives. With the spread of smartphones, conflicts and annoyances arise due to interruptions and intrusions of devices during social interactions, a phenomenon called technoference by McDaniel and Coyne (2016). This research sought to investigate the influence of the use of smartphones on the relationship between parents and children and, thus, to understand how the presence of technology interferes in the family context. Thirty caregivers of 8 and 9 year old children from the states of Rio de Janeiro, Minas Gerais, Curitiba and Goiás, from different economic backgrounds participated in the study. Semi-structured interviews were conducted with participants via video calling using WhatsApp during the Covid-19 pandemic period. The data were analyzed using the ATLAS.ti software, within a qualitative and quantitative approach. Among the main results, different impacts stand out, such as the use of parents; smartphone during interactions with their children. Associations were noticed between technoference - cell phone invasions during interactions between parents and their children - and conflicts in family life. The interviews point to parents; worrying about their own use of the technology, and about the use of other family members, generating dissatisfaction. On the other hand, parents also highlighted the shared use of touch screen technology as an ally resource in interactions with their children. The present research provides indications about the need for future discussions regarding the benefits and harms of the use of smartphones by parents and children in the family environment.