We have adopted thru foster 4 children, 3 from same birthmother. At the time of termination(she relinquished in middle of court), she had another one year old and was pregnant, and has since given birth. In our state, because of her relinquishment, her slate is wiped clean, and if the children come into state custody, she starts the system anew.
We keep our case open, as my hubby says...shots current! just in case, to keep the siblings together.

It tears me apart, that they have siblings out there, and can't know them yet....
__________________
although someone breaks your heart,
you can still love them with all the little pieces