Dear Karol, It is possible to extract DNA from personal items such as a toothbrush, sweaty ball cap, blood stains on clothing, teeth, etc. It can also be extracted from hair from combs, brushes, or shavers. There are numerous labs which do this sort of DNA extraction e.g. PaleoDNA Lab in Thunder Bay, Ontario, Canada and various forensic labs in the USA. It's not cheap ( around three hundred dollars to extract the DNA and one hundred to three hundred dollars more to test mtDNA, Y chromosome or racial percentages). Also, there is no guarantee that the extraction will be successful. Perhaps you can find a suitable item of your father's to test. Best regards, Nicole May njmay@aol.com