vaccine question

Vanessa • Xavier Michael & Zachariah Heath 8.8.16 💙💙 Willow Evelyn due 6.11.17❤️
I have a very random question***
My boys are 5 weeks old, yesterday they got there second round of hep b vaccines. Those are the only shots they have gotten hep b at brith and then second round yesterday. 
My nephew is 3 months old and the mother has chose to not have him vaccinated. 
Are my boys able to pass anything through adults that see all three children, to my nehpew? 
And if so does anyone know what vaccines exactly that my boys will get, that could infect my unvaccinated nephew, if any at all.