This constructivist grounded theory (CGT) study examines Latter‐day Saint (LDS) parents' process in coming to accept a transgender or gender diverse (TGD) child and the factors that impact acceptance. Data come from interviews with 38 LDS parents of TGD children and 130 Facebook posts from the same population. Data were analyzed using CGT methodology in coding and theory construction. A model of LDS parents' process in accepting a TGD child and the factors that impact that process are presented. The results indicate that coming to accept a TGD child tends to engage LDS parents cognitively, emotionally, socially, and spiritually, and is a developmental process. We identified four stages of parents' process: assimilation of new information, deconstruction and disequilibrium, reconstruction and accommodation, and acceptance; as well as typical emotional responses in each stage. We found that factors that impacted parents' process included parents' pre‐process characteristics and contexts, religiously defined meaning making, social embeddedness, external resources, community building, and spiritual autonomy. Additionally, we found that parents' commitment to their child's wellbeing and connection with their child (i.e., attachment) motivates their process and that their personal spiritual experiences tend to guide it. Parents in the study who reached a state of acceptance expressed that their process had been both deeply challenging and profoundly, personally meaningful. This study strengthens the case for using attachment‐based therapies with this population and indicates the value of incorporating spirituality into the therapeutic work.