How would someone progress going on for adopt another party as a sister even tho they own never met?

my friend and i want to adopt each other as brother and sister
no such article.
Legally, you can't adopt each other as brother and sister, although it'd be cool to put together up official looking certificates, and have a celebration dinner to be glad the event, kind of done up wedding style, with a friend acting approaching the justice of the peace, declaring you brother and sister.

In order for you to rightfully be brother and sister, one of your parents would have to adopt the other one, which can be done, even as adults. The only other way is if you married a brother and sister and become brother and sister in-laws.
Answers:    3 cups of self-raising flour
Pinch of salt
80g butter
3/4 cup water

preheat oven to 200°C. combine and mix said ingredients. warmness for about 30 minutes ...

or

talk to ya parents.
not possible dumbass
You can't adopt someone as your sister. The only way to legally become brother and sister would be for your parents to rightfully adopt her as their child, or her parents to adopt you, which would mean your parents would have to agree to give up adjectives legal rights to you- so, it's probably not going to happen.
cute!

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