5 Persons who are residents of Mauritius
(1) Subject to section 6, any person, not being a citizen, shall have the status of a resident for the purposes of this act where -
(a) in the case of a Commonwealth citizen, he has, before 14 December 1968, been ordinarily resident in Mauritius continuously for a period of 7 years or more and since the completion of that period of residence has not been ordinarily resident continuously for a period of 7 years or more, in any other country;
(b) in the case of an alien, he has, before 10 December 1966, been ordinarily resident in Mauritius continuously for a period of 7 years or more and has since the completion of that period of residence not been absent from Mauritius for a period of 3 years or more;
(c) he is the spouse of a citizen;
(d) he is a child, stepchild or lawfully adopted child, under the age of 18, of a person to whom any of paragraphs (a) to (c) applies;
(e) he is a person to whom permission has been granted by the Minister under subsection (2) to become a resident;
(f) he is a holder of a residence permit issued under section 9.
My wife was born in Mauritius, but I know of someone born in England to Mauritian born parents who got citizenship like your wife and her husband (Irish by birth) got his residency about a year ago.
On the Govt website there is a list of documents needed and what needs an Apostile seal (birth certificate & marriage certificate from memory). Residency is handled at Immigration Office on the mezanine floor. There are different permits dealt with on different places.
Unless things have changed residency is an entitlement under legislation. Citizenship I believe you can then apply for once you've "done your time".
This is the link with info http://www.gov.mu/portal/site/dhasite/m ... a/#rpermit
The process for residency certificate takes some months once they have all the info. A morality certiticate that they ask for is a police clearance from your country of birth to show you have no criminal convictions.