Murilo Huff, the father of Léo, son of the late singer Marília Mendonça, has engaged in a legal battle with Dona Ruth Moreira, Marília's mother, over the custody of the five-year-old child. Huff initially shared custody of Léo with Dona Ruth, who had been caring for the child since the singer's death in 2021. In June 2025, Huff filed a request for unilateral custody, citing "serious and alarming situations" and alleging negligence and alienation by Dona Ruth. He also revealed that he discovered information he could not publicly disclose, which motivated his legal action. Huff has publicly refuted accusations from Dona Ruth that he failed to pay child support, detailing expenses exceeding R$ 15,000 (Brazilian reais) for Léo's education, health care, and diabetes treatment. The dispute has been marked by mutual accusations and family tensions, including claims that Dona Ruth impeded Huff's access to information about Léo's health and that she acted unilaterally in ways detrimental to the shared custody arrangement. The conflict extends beyond custody, involving concerns over the management of Léo's inheritance, estimated at around R$ 500 million, left by Marília Mendonça. Huff expressed worries about the family's use of the child's assets. The legal proceedings included a two-hour hearing where an amicable agreement was sought but not reached, leading the judge to grant Huff provisional custody. Léo has since moved to Huff's residence. Dona Ruth has contested the decision by filing an appeal and continues to make public statements expressing her distress over the situation. Additional controversies have surfaced involving Dona Ruth, including allegations that she demanded half of the insurance payout from the 2021 plane crash that killed Marília Mendonça and others, which her legal team denies. The dispute has drawn public attention and emotional responses from family members, notably Marília's brother João Gustavo, who has publicly defended his mother and called for an end to online attacks against her. Legal experts have noted that the court's decision was influenced by evidence such as audio recordings from caregivers and testimonies, which highlighted concerns about Dona Ruth's conduct. The case remains ongoing, with Dona Ruth's legal team indicating plans to present further evidence to challenge the custody ruling.