Considering how many fathers in the DWU are not specified as biological, this category is open to some of the worst kind of speculation.
Per T:GENDER, no categories whose topics are not directly related to gender may use gendered language. Thus, 'adoptive fathers' should never exist, as gender has no bearing on adoption. This particular category is allowed by T:GENDER because sex has a direct link to sexual reproduction, and biological fatherhood is a characteristic, dependant on sex, of sexual reproduction.
If you are unsure whether or not an individual is a biological father (by means of sexual reproduction), please do not place them here.
The following 200 pages are in this category, out of 224 total.