Every third-country refugee accepted to EU territory has the right under the Family Reunification Directive to bring all his relatives later on. Demonstration of family ties is considered to be humiliating and therefore the refugee can invite whoever he/she wants and it does not have to be proven.
The Family Reunification Directive literally says that "the right to request family reunification is only granted to holders of a residence permit for at least one year and who can reasonably be expected to have permanent residence." It is clear that it is not about the right to family reunification, but the right to apply for family reunification. The application must be accompanied by family ties, such as those concerning close relatives (husband / wife, child, mother, father). The applicant for family reunification must be able to prove on request that he has accommodation that complies with the general safety and health standards, health insurance and permanent income for his / her own nutrition and for the maintenance of his / her family members. Moreover, it is clearly stated that "the Directive does not apply to applicants for refugee status" http://eur-lex.europa.eu/legal-content/CS/TXT/?uri=LEGISSUM%3Al33118.