I am very afraid of mrsa infection. had groin infection confirmed two weeks ago, finished treatment of bactrim (sulfamethoxazole and trimethoprim). am i a danger to family and spouse?

Not to worry: Probably your MRSA is already around your home and it's likely your spouse is already carrying it (from sharing a bed, etc). Maybe others in the house as well. But that's probably as far as it will go. It's normal to have staph on the skin, and mostly no infection results. You were unlucky, but that doesn't mean the others will be. MRSA is no more virulent than other staph, just harder to treat.