Yes, there is such an option. St Lucia immigration authorities may consider the application for your relatives’ citizenship sent though your agent if:
They could have been included in your first application as they meet St Lucia citizenship by investment requirements, and the period of time between your first and second application (for your relative) doesn’t exceed 5 years.
They are a child who was born after you prepared and submitted the application.
They are your spouse whom you married after you submitted St Lucia citizenship application.