Upbringing of an autistic child carries additional challenges. Many studies have proven the negative impact of stress on intimate relationships and elevated level of stress among parents of autistic children. Growing up brings with it individual and situational changes, and represents a problem especially for autistic people. Due to the complexity of their needs and the unavailability of support and programs for adults, the role of active parenting is prolonged and the parents of autistic people are faced with higher demands, compared to parent of neurotypical people. The goal of this qualitative study is to present the impact of stress on conflicts in intimate relationships of parents of adult autistic persons. The research is as part of a larger study "Providing support to adults with autism spectrum disorder (ASD)", which was conducted by Professor Alexander Jensen from Brigham Young University (BYU) in collaboration with the Faculty of Education and Rehabilitation at the University of Zagreb. The participants were selected using non-probabilistic convenience sampling method and meet the criteria of parenting an adult autistic person and being in an intimate relationship lasting at least 6 months. The results of the research were obtained by conducting semi-structured interviews and analysed using qualitative thematic analysis. This research provides an insight into the complex situation in which families of autistic people find themselves, which is caused by the demands of the disorder itself, communication difficulties, but also the lack of formal support, i.e., a social context that is not supportive for autistic adults. In addition to the sources of conflict, the research also defined different methods of conflict resolution, which include talking, short-term separation before continuing the interaction with the partner and reaching a compromise.