Question about transmission to my kids from their aunt

[Funmom39]

I recently found out my sister has chronic Hep b, likely from birth (she is adopted so different birth moms). Two of my three kids (ages 8 and 6) have not received the vaccine because my oldest had a life threatening reaction to her third dose as an infant, so her doctor recommended we wait til older for her siblings.
Now I’m panicking a bit that they haven’t been vaccinated. We see my sister about 5 times a year (she lives out of town) and she says her viral load is so low, it’s like being undetectable and very, very unlikely to transfer. Her husband has not gotten the virus from her and neither did her siblings growing up to our knowledge (we have all been tested multiple times due to pregnancy etc). Assuming she had it then of course.
Yesterday, we were about to say bye after her visit to us and finishing a meal. I noticed she had just picked a bump on her face, making a slight bit of blood visible-or really just you could see the red inflammation like it you picked a small pimple. I tried to just have us wave bye to her, but she hugged all 3 of my kids and kissed them on their heads (on hair). Meaning potentially her finger had blood from where she picked the bump, and the bump was right next to her mouth, so likely could have had small transfer from kissing their heads. I immediately panicked and brought them home. They all bathed or showered right then. No visible scratches or broken skin anywhere near where she touched. Maybe a small scratch on the very bottom of one daughter’s leg. So my question- is this an actual risk with no broken skin? Could the bath water have somehow moved the small viral particles down to an open wound on my daughter’s leg? Even that sounds crazy to me- it was a bath full of water- can’t imagine any virus could infect when that diluted, but my mind is playing tricks on me. Can someone ease my mind on this? Was any of this potential transmission? I will look into starting the vaccines and potentially testing them, but it wouldn’t do any good to test yet if this has any potential to transmit.  These are my babies and I’m worried.  It is  also their aunt who will always be part of their lives. Should I chill about this situation and just make a plan going forward?

[stef2011]

you may use HBIG (but it is extracted from donated blood, i d stay away from it these days) or just monitor and take antivirals if hbsag becomes positive (it is the first to get positive before disease starts so you are on time to clear it easily)

[stef2011]

when hbvdna is undetectable by antivirals you dont transfer infection even to the baby,i dont think there s any risk.how old are your kids?are they immune deficient?it is extremely rare to get it chronic if not from your mother at birth like all adulst clear it

[Funmom39]

They are 8 and 6 and healthy. My sister is not on anti virals bc she has never needed them, I’m not sure if she is completely undetectable but super low. So you wouldn’t be worried?

[stef2011]

forgot to clarify transfer infection even to the baby...from mother to baby at birth.if she has very low hbvdna and there are no cuts on your kids it is impossible

[stef2011]

i mean open cuts with fresh blood on your kids and fresh blood from your sister too

[Funmom39]

No open cuts near where she touched them. Maybe one cut on daughter’s leg (she kissed their heads and hugged their shoulders). A bath or shower  couldn’t somehow move the virus down to a cut right? It would kill it?! A full bath and I used soap. May have been a slight bit of fresh blood from my sister when she kissed them- she had picked a bump and it may have had like a drop. But I doubt anything got on them.

[Funmom39]

Also no  big fresh cuts on my kids. Just a slight surface scratch or two from day to day life,  not near the area she touched and Probably already mostly closed or scabbed. No large drops of blood or gushing blood from either party, maybe just a bump grazed my kids’ head  or shoulder that could have had slight blood on the surface of it. I don’t think it’s transmitted this way, just hard not to be paranoid. I bathed them. No visible blood from her anywhere on them. She kissed their heads and hugged
Them