is it safe to adopt a child with Hep C when there are 4 other children in the house

My cousin, who was just sentenced to 6 months in prison, has a 2 year old son. She has asked family for help while she is "away" to take care of her son. Everyone's obvious choice was me because I have 4 children of my own and I am a stay at home mom. My children are 2, 6, 7, and 14. I am glad to help, but my cousin's son was just diagnosed with Hep C. I am wondering if it is smart or safe to have him live with my family. I am concerned that toddlers fall, and they fall often. They scrape their knees, arms, faces, and any other exposed skin. I can say from personal experience that we go thru a box or 2 of bandaides a week here. We mostly go thru so many because the little kids dont keep them on. I am sure this boy is the same way.
Please, any advise anyone has on this would help. It is life changing enough to go from 4 children to 5, even more so when the child is not your's biologically, then to add medical complications on top of that is just way stressful. Help....Please?!?!

[HCA]

Infection within the family is very rare.
Many including myself raised children whilst (unknowingly) having Hep C with no problem.
The disease is infectious rather than contagious.To contract it the uninfected person has to mix blood with one who is carrying the virus..
It's a tough decision for you because although the odds are very small indeed it may be a lingering cause of concern.
Most patients aquired it intravenously either in hospital or fooling with drugs.

[FlGuy]

Whether the kid has hep-c or not is not the determining factor.  Decide based on other factors.

[Xenigma]

"""even more so when the child is not your's biologically""""
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Very sad statement you made above.  
Taking in a child for 6 months and adopting a child are 2 different issues.