There is one important correction: he does not have a Constitutional right to citizenship because his parents are Citizens by Registration, not by birth. This is not just specific to Antigua or to Citizenship by Investment. In all countries, even Canada, there is a difference between citizenship by birth and citizenship by registration, and sometimes the citizenship rights that are handed down to future generations will vary based on how you became a citizen. So your son has the right to be added to the existing application as long as all conditions are met, but because he is a citizen of Russia, that is a restriction that cannot be circumvented at the moment.
