Here is a link on what is necessary to obtain Portuguese citizenship. https://justica.gov.pt/Como-obter-nacionalidade-portuguesa/Reside-legalmente-em-Portugal-ha-pelo-menos-5-anos. Already posted above.
Midway down the page you will find Documentos necessários and in the second section below that entitled " Um documento que prove que conhece suficientemente a língua portuguesa. Esse documento pode ser: Which means the applicant for naturalisation needs a document that proves he/she knows the portuguese language sufficiently. The proof can be: a certificate from a public school or other recognised exam certificates of the language. People who apply from lusophone countries are exempt. It is stated that if the applicant cannot read or write (illiterate or too young) “o teste de conhecimentos da língua portuguesa tem de ser adaptado à sua capacidade para demonstrar que conhece a língua.” That is, an adapted test will be used. They do not go further into what these adapted tests are, but communicating with the Liceu Francês will probably be the only way to find out more about the adapted tests for a child of 10 or below.
In all EU countries it is a requirement that people are able to communicate at a basic level in the national language before being given citizenship. It increases the prospects for integration.
Some useful information here also: Portuguese Citizenship application after 5 years of Golden Visa
I should have mentioned that there are a number of youtube courses for kids, and several teachers on italki have one-on-one classes (& group classes).
Here is a link for young children at the Institute Camoes: Children and young learners - Camões - Instituto da Cooperação e da Língua
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