Two men entered my home while my husband and child were there. They were plumbers. By law can they do that? Please assist.-I live in a...

You don't say what state you're in, but typically, if you live in an apartment or condo that you are renting, or even a duplex, the landlord has the right to enter the premises to make repairs which may damage the property.  This is probably in the fine print of your contract.  You say you are buying the home, so until you do, the owner does have the right to enter.  However, I would specify that he/she should not do so unless someone is present.  Your husband was there, but not expecting them.  I would feel uncomfortable that perhaps they were entering when no one was home.  Check your lease/contract agreement and then make sure your landlord understands that no one should enter your home (which it is as long as you are paying rent and are up-to-date on your payments) without your knowledge and permission.