T.F.
My brother and SIL are foster parents. They have 2 bio children 16 and 14.
The first child they got was 6 months old, bi-racial beautiful little girl who was found on her dead mom's body. Mom died of a drug overdose. After 2+ yrs and expressing huge interest, they finally were awarding final custody of her. She is 5 now, smart as a whip, beautiful and thriving.
They also have had other children at times, babies and mostly young boys. They only had 1 child with issues that were so bad that they had to have the agency re-home him because they had to make a choice... this child or the children of their own being witness to the outbursts and potential danger to them. It was heartbreaking but this child had been abused badly and to come from a badly abused home to a loving home pretty much threw him over the edge.
Of course they have no regrets with the 5 yr old now their own. They have maintained contact and visitation with her maternal grandfather so she has a connection to her bio family.
Another negative I've seen is the pressure they put on their own children in all the responsibillities to care for the foster children they have. It seems sometimes like the bio children are losing out. I know brother and SIL have hearts full of love but their own children also need more nurturing than they seem to get.
It is a tough balance.