The answer to both questions is yes. You will be able to include him in your application as a dependent and for sure Dominica's health care will be available to him like it is for every other citizen.
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What are the rules concerning children with special needs for Dominica’s citizenship by investment program?
I am contemplating applying for Dominica citizenship, however, I have a son who is over 30 years old but he has special needs, so he remains my dependent. Will I be able to include him in my application and would he be able to make use of Dominica's healthcare facilities in case he needs to at some point?