Wolfram Alpha is so much easier to use than a relationship chart!
Figuring out the precise relationship (which kind of cousin? how many times removed?) between yourself and your relative can be confusing. But this online calculator not only identifies the relationship, but show it visually in a chart as well..
For example, if you enter the words "my cousin's son" ...or, "my mother's cousin"...the answer is "first cousin once removed" and the chart shows in what way you are related.