If you suspect signatures have been forged, especially concerning legal documents or a relative's affairs, several steps can be taken. You can apply to the court to have the signatures verified by forensic experts (FSL/CFSL). Alternatively, you can engage a private handwriting expert, though a court-ordered FSL report carries more weight. If challenging documents due to a relative's mental incapacity, obtaining a medical certificate and legal representation is the first step before pursuing court action and forensic verification.