**Traders assign an 80% implied probability against Elon Musk securing full custody of his son Romulus with Ashley St. Clair because family courts typically prioritize the established primary caregiver in disputes involving very young children, and available details point to St. Clair having served in that role since the boy’s September 2024 birth.** St. Clair filed early for sole custody in New York after publicly identifying Musk as the father in February 2025; court filings note he was absent from the birth and had limited subsequent contact. Paternity was later confirmed via testing. Musk publicly stated in January 2026 that he would seek full custody, citing St. Clair’s social-media comments expressing remorse over past remarks on transgender issues and referencing his daughter Vivian. No subsequent court filings or rulings have surfaced indicating momentum toward Musk prevailing. Recent public exchanges through mid-2026 have centered on financial disputes, with St. Clair claiming reduced support and rejecting multimillion-dollar NDA proposals, while she continues her podcast and separate litigation against xAI. These developments reinforce the perception of a protracted, contested proceeding in which the mother’s established caregiving and legal positioning create substantial barriers to a full-custody outcome for Musk. Upcoming hearing updates or settlement signals remain the key near-term catalysts.