Assuming you are speaking of two or more females, yes.
There is no difference legally, socially, or in this day and age, culturally, between "adopted" and "biological". One has a genetic link to the parent, the other does not. That is all.
Yes, children with Down syndrome can get adopted. I have two sisters, both have Down Syndrome, and both were adopted. They are amazing :)
yes. one had three children that were not adopted.
yes and he adopted his sisters daughter Lanie.
No, but Maxene had a adopted son named Peter and a foster daughter named Aleda
he has seven brothers and three sisters. His parents also adopted eight children.
carlisle has no adopted brothers or sisters
You talk to them.
no
Catherine Bunin has written: 'Is that your sister?' -- subject(s): Adopted children, Adoption, Juvenile literature, Sisters
he had 4 adopted children
Yes
I know Angelina Jolie adopted several children.