Fathers have a major impact on the degree of interest their daughters develop in math. That's one of the findings of a long-term study that has traced the sources of the continuing gender gap in math and science performance.
Davis-Kean, P. (2007). Educating a STEM Workforce: New Strategies for U-M and the State of Michigan. Paper presented at Educating a STEM Workforce Summit, Ann Arbor, May 21. http://www.ns.umich.edu/htdocs/releases/print.php?htdocs/releases/plainstory.php?id=5895&html=