hi sorry your dad may have a leak the best way to tell is to get the fluid tested the protocol for collection and testing for betta 2 transferring must be followed or false results may come back please see link
kind regards vini
http://www.bcm.edu/oto/grand/120398.html
http://www.mgh.org/lab/CATALOG/TESTS/5032.HTM
http://www.aruplab.com/guides/ug/tests/0050047.jsp