The involvement of fathers in early childhood character education remains relatively low, while educational media specifically designed to support fathers in parenting are still limited. This study aimed to develop a guidebook entitled "Ayah Inspirasiku: Menjadi Teladan Karakter Anak Sejak Dini" as a parenting support medium for fathers of children aged 4–6 years. The study employed the Research and Development (R&D) method using the Borg and Gall development model simplified into five stages, namely research and information collecting, planning, developing the preliminary product, expert validation, and product revision. The research was conducted at TK PGRI 4 Mataram. Data were collected through expert validation questionnaires involving a material expert, a media expert, and an early childhood education practitioner. The data were analyzed descriptively using percentage-based feasibility analysis. The results indicated that the developed guidebook achieved a "highly feasible" category based on expert evaluations. The guidebook contains practical parenting materials, father's role explanations, daily character-building activities, and reflection sections designed to assist fathers in implementing character education at home. Therefore, the developed guidebook is considered feasible as a parenting support medium to strengthen fathers' involvement in early childhood character development.
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