I'd use their name. They are not related to you as you do not share a common ancestor.
Your "step" cousin
ex stepdaughter? that probably doesn't help any
your step niece,,, if it was your brothers own daughter it would be your niece, since its his stepdaughter, than its your step niece.
step-granddaughter
If I were you I would call her by her name, if she has a nickname she likes to be called then that will do, just do your best to keep it casual. As a practical matter, the English language does not have a relationship term for a stepdaughter who is not your stepdaughter any more because of a divorce. If you have a continuing relationship with her, you should feel free to continue to call her your stepdaughter, or even your daughter, depending on how close the relationship is.
"Stepdaughter" is typically written without any additional punctuation, as it is a compound word combining the words "step" and "daughter" to refer to a person who is the daughter of one's spouse from a previous marriage.
This is an internet myth. There is no evidence that Barack Obama has a step-daughter.
Stepsister stepmother stepfather stepbrother stepdaughter stepson. All i can think of.
I call them my uncles
>Two: If two men marry each other's mother they automatically become >half brothers, and if they each have a son, then the other one's son >is automatically nephew and uncle! This answer is right, if you do not distinguish between full brothers, half brothers and step brothers, precisely full uncles and nephews, half uncles and nephews and step uncles and nephews. (If my stepfather married my stepdaughter, I am my own grandfather?) If not, the answer "Three" will be right. Three: 1. Old uncle e.g. Scrooge McDuck 2. Old nephew = young uncle e.g. Donald Duck 3. Young nephew = e.g. Dewey Duck
No. This is an internet myth. There is no evidence that Barack Obama has a step-daughter.
A lady who is the step-daughter of your spouse's brother could perhaps be introduced as "my step-niece". But why not just introduce her as your niece? "My niece" seems friendlier and kinder, and if anyone needs further details, by all means, give them.
Compound word with the word step in it: footstep,instep,stepson,stepbrother,stepchild,stepdaughter, stepladder, stepparent, stepsister