Family reunification with a foreigner on an approved temporary residence permit is a legal ground for their spouses, children, common-law partners, and some other family members explicitly enlisted in Law on Foreigners, to apply for the temporary residence permit.
Take the example of Ivan Ivanov. His wife Natalia can move together with him to Serbia, or she can join him later on, once his temporary residence permit is approved. Their two minor twins, Maria and Vera can come with them and apply on the ground of family reunification, but their son Viktor, who is 20 years old, cannot apply for the temporary residence permit on the same legal ground as his minor sisters. But, Viktor can be employed in his father’s company, or if his father Ivan decides to employ in a Serbian company, maybe Victor can also try to find a job on the Serbian market, or open a consulting firm (entrepreneur’s agency).
As it can be seen from this example, spouses and minor children are entitled to seek temporary residence through family reunifications, but people over 18 years, are not entitled to apply based on this ground.
You are probably wondering how Russian citizens can indeed prove their family relations. That is why Russian citizens should have in mind the obligation to bring Birth Certificates and Marriage Certificates once moving to Serbia.
One of the many perks is that due to good bilateral relations between Russia and Serbia, there is no need for international legalization of those documents. In other words, Ivan and Natalia should bring their Marriage Certificate, and Birth Certificates for Maria and Vera. Once they come to Serbia, they will translate the abovementioned documents into the Serbian language, and they will be ready for use.