I have a bad problem with staph in my house and need to know why we have it about once every couple of months?

Question unclear: I think you are asking why persons in your household get recurrent episodes of staph cellulitis, rather than disinfecting your house (which is not the problem). Your doctor can use a combination of Mupirocin (bactroban) in your nose and daily washings with a soap containing Chlorhexidine (but you cannot wash with anything else), and every carrier will have to do this, only 50/50 success rate.

Confusing statement: Staph is everywhere. Most humans carry non-invasive species on their skin surfaces starting hours after birth. It ends up transiently on surfaces like countertops, doorknobs, or any where a hand or fingers place it. Invasive strains end up in similar locations & are easily transferred into the home. Good hand washing helps reduce the spread of any germ including staph.