Can you tell paternity from blood type? Can I figure paternity out through blood types and Rh factors?

Not really. It would be possible to rule out an individual using blood type in a paternity test, but it would be unlikely to confirm paternity based on blood typing analysis.
No. It is not accurate enough. It can rule some people out as the blood types transmit by straight genetics.
Not with any. Degree of precision for such an important topic.