Personally i think that should be left to the mom, unless the woman is the legal gaurdian.
Physically, yes, a woman and her nephew can have a child together. In most places, however, this would be considered to be incest and illegal. In some parts of the world, it might be punishable by death. And if the nephew was not an adult, it would be child sexual abuse on the part of the woman, punishable in the US by jail time.
You are your great nephew's great aunt if you are a woman, or his great uncle if you are a man.
Your nephew's daughter is your great niece. You are her great aunt (if you are a woman) or her great uncle (if you are a man).
Your nephew's daughter's son is your great grand nephew (or great great nephew). You are his great great aunt if you are a woman, or his great great uncle if you are a man.
Your sister's son is your nephew. You are his uncle if you are a man, or his aunt if you are a woman. Your sister's son is your nephew.
Your nephew's daughter is your great niece and you are her great aunt (if you are a woman) or her great uncle (if you are a man).
who the woman in stripes shower scene
It depends on the family and friends of the woman having her fifth baby whether they want to have another baby shower for her. There is no set etiquette for this so a woman can have one or many baby showers for each child.
Your nephew's great grandson is your great great great nephew and you are his great great great aunt (if you are a woman) or great great great uncle (if you are a man).
Your nephew's daughter is your great niece. Her son is your great great nephew. You are his great great aunt (if you are a woman) or his great great uncle (if you are a man).
In French, an adult woman is "une femme".
He knew her nephew. -APEX