No. Gautam Buddha’s father was not Jain.

• In Jain texts, Siddhartha (Gautam Buddha) is presented as a contemporary of Mahavira, not as a Jain Tirthankar. Buddha is not counted among the 24 Jaina Tirthankaras, and his father is described as King Suddhodana of Kapilavastu (Shakya clan), not a Jain. The Jain tradition treats Mahavira as the last Tirthankar of his time, and does not identify Buddha as Jain by lineage or status.