Cat was trying to jump on my lap. missed and dug his claws into my thigh, enough to make it bleed 3 tiny dots on leg. several family members have got scratched by same cat and been ok. what are odds of getting cat scratch fever? how severe is it?

You should be fine if you are healthy and family members have not had problem with the same cat so the odd is low. However, if you unfortunately catch the disease which is typically characterized by self-limited regional lymphadenopathy (enlarged regional lymph nodes). This disease can be treated with antibiotic(s) even with the serious disseminated forms.