@Charro6Unfortunately, TV stories are not terribly popular on SOL, and few authors here are particularly well-versed in the real TV lifestyle (rather than relying on outdated stereotypes).
Realistically, few older men make convincing TVs, as they stand out like sore thumbs, and thus embarrass their families. Plus, most TV are closeted transexuals (from the days when changing ones sex wasn't yet an option), which only complicates normal plots.
The only way I can see it working, storywise, is if the guy is naturally slight of build and somewhat effeminate, and only gets outed when he either comes on to his son, of confesses to his wife. The odds of his wanting to screw his daughter would be slight (mainly because she'd remind him he'll never make a convincing woman).
However, this story would requires that:
1: the son and mother already have an ongoing sexual relationship
2: the father either comes out as trans, or is somehow outed by someone else
3: the family somehow decides to accept his 'as is' despite never having really known wth he is. :(
An easier approach would be to make it a 'femination' story, where the ex-husband wants back into his ex's life, and she insists on humiliating him by making him TV. The kids, witnessing their questionable actions, decide they want to be a part of it. Now that would work, storywise, though it would be difficult to care about a lead character who willingly humiliates himself.