Yes, families of Overseas Filipino Workers (OFWs) can avail themselves of the 20% senior citizen discount in the Philippines. This benefit applies to senior citizens when purchasing goods and services from participating establishments. However, it's important for OFW families to ensure that their elderly relatives have valid identification, such as a senior citizen ID. For detailed information or questions specific to your situation, it’s advisable to consult with local authorities or check the official government resources.