First, the society does not allow boys and girls to associate with each other. Second, the places where people can meet freely do not exist. As a result, people adapted their own ways for choosing a bride. In other words, she knows all the families. Another way of choosing a bride is through the relatives themselves.
Young men know that they can choose their brides from their families.
Seeing the bride is not necessary at all, for being a relative is quite enough reason to marry her. The girl shares the same blood with the boy, so she is worth marrying. Along the same lines, Seidi people do not allow strangers to marry their daughters easily. Priority goes first to the cousins, but the cousin has to be from the father's side. This guarantees the continuation of the family name.