I'd like to start by saying, I've seen the question, How can we prepare our child for the arrival of adopted siblings and although I have not looked at every linked resource thoroughly, it looks like a wonderful resource, but my question is a little more specific.
My daughter is seven and has wanted a younger sibling for ages, so all of the links on that other question will be relevant and helpful in regard to the part where my daughter thinks this sibling is explicitly for her - and she will definitely need to learn about space (I imagine her thinking she gets to direct everything the other child does and being disappointed when her new sibling isn't interested in the same things she likes) so I am glad to see the question at least partially already here.
For this question, I am referring more to the "fostering" portion of what we are doing.
Concern number 1: There is a very good chance we will have children in our home who simply need short-term care and who are not available to be adopted, while the child we eventually will adopt is being matched up with us. How do I help both children when it comes time for "good-bye," and how do I help my daughter understand good-byes will likely be part of the process?
Concern number 2: Helping my child fully understand why the children who need fostering, need fostering while respecting the foster child's privacy and rights while also helping our biological child develop empathy and tact. She'll know, at least on some level, that these children are in our home for what are often likely nefarious behavior on the part of a birth parent (or both).
I would love to hear from parents that have had personal experience with this, psychiatrists or social workers. Thanks so much in advance.