Can one of three beneficiaries force a sale?

Yes, one of three beneficiaries can force a sale of the property if the interests of the beneficiaries are not aligned and the property cannot be divided equitably. This is typically done through a legal process known as a partition action, where a court can order the sale of the property and distribute the proceeds among the beneficiaries. However, the specific laws and procedures can vary by jurisdiction, so it is advisable to consult a legal professional for guidance.