Sociology deals with society [people];how people interact, their culture, norms, values just like other social sciences like psychology, economics, psychology which also deal with people and how they behave, their mental processes.
There is also a relationship between sociology and economics which is another social science. economics deals with the production of goods and services and how they are distributed to people just like sociology which also consider how the goods are distributed to members of the society.
The answer sciences related to sociology are social sciences. Social science are sciences which deal with people and have the following characteristics; observable, measurable, practical, factual. psychology and sociology link on that they al deal with the behavior of people, psychology deals with the behavior of people and their mental processes just like sociology which also seek to understand how people's behavior affect society.
Anthropology and sociology also deal with society but the only difference is that social anthropology mainly considers small states and their culture but their area of studies is basically the same.
Sociology and political science are also related in the sense that they both concern the welfare of people in a society. Political science basically deals with the distribution of power and the exercise of power, democracy, dictatorship, and communism, how people vote etc.
History is another social science which is related to sociology. History primarily deals with past events and how they affected society e.g. how the colonization of Africa underdeveloped Africa. Sociology on the other end will be concerned with how people interacted, how culture was affected etc during the colonization and the present.
Geography can also be a social science which deals with society just like sociology. The population studies, demography, health and environment are all geographical studies which deal with society