Visualization gives opportunity to approach huge network type of data and makes it easily comprehensible. The content of this paper is divided into several sections such as visualization usability, family tree visualization, graph theory of kinship network and graph visualization. It focuses on existing techniques and applications that are currently available to address family tree visualization issues. This paper reviews some of the previous research related to family tree (or sometimes known as genealogy) data visualization. The leading benefit of visualization is that it does not only provide graphical representation of data but also allows changing of form, omitting what is not required and browsing deeper to get further details. Visualization is an important and helpful ways to support the exploration of large data sets.