Methods and apparatus to distinguish between parent and child webpage accesses and/or browser tabs in focus are disclosed. An example implementation includes identifying an HTTP request; retrieving Page Info data from a browser; electronically detecting if the Page Info data and the HTTP request identify a same Internet resource; electronically classifying the HTTP request as a parent call when the Page Info data and the HTTP request identify the same Internet resource; and electronically classifying the HTTP request as a child call when the Page Info data and the HTTP request identify different Internet resources.