Our Relative Just Found Out That She Has A TB,

Our relative just found out that she has a TB, she lived at my parents house. My parents would probably exposed to the germs already. We are spending a family re union, is there a danger on our children if we pursue the occasion. How to disinfect the whole house and one of my sister is planning to have a baby, is it dangerous for her to visit at our parents place??What are the means and ways for my sister and the whole family be free from this kind of illness and to prevent from spreading.