Your mother's mother is your grandmother.
Your grandmother's sister, whether elder or younger, is your great aunt.
Your great aunt's granddaughter is your second cousin.
While some ethnic groups, religious groups, and a few legal jurisdictions do not accept marriages between second cousins, most jurisdictions do permit it.
So if you are willing to deal with possible disapproval from some family members, you could marry your great aunt's granddaughter - as long as you are male, or you live in one of the few places where gay marriage is legal.
no....because she is a sister for you
It is not legal to marry your own daughter or granddaughter anywhere in the US.
Two sisters may marry in Nebraska but they may not marry each other.Two sisters may marry in Nebraska but they may not marry each other.Two sisters may marry in Nebraska but they may not marry each other.Two sisters may marry in Nebraska but they may not marry each other.
A Hindu boy can marry his mother's sister's son's daughter if he can support her. This is legally acceptable on a Vivah Sanskar.
The children of sisters are first cousins. In most jurisdictions, first cousins can legally marry, but sometimes the family culture or the broader culture of the region frowns on such marriages.
can it be an incest if a son and a daughter who are related because of their mothers who sisters marry each other?
sure
no because they are in the same family as you
yes of course also you can marry your cousions
brothers can't marry sisters it's against the law, but you can marry your 2nd cousin and down.
Never Ever. It is forbidden per Islam teachings; as stated explicitly in Quran; for A muslim man to marry his mother, sister, daughter, ...Quran says (Meaning English translation):"Prohibited to you [for marriage] are your mothers, your daughters, your sisters, your father's sisters, your mother's sisters, your brother's daughters, your sister's daughters, your [milk] mothers who nursed you, your sisters through nursing, your wives' mothers, and your step-daughters under your guardianship [born] of your wives unto whom you have gone in. But if you have not gone in unto them, there is no sin upon you. And [also prohibited are] the wives of your sons who are from your [own] loins, and that you take [in marriage] two sisters simultaneously, except for what has already occurred. Indeed, Allah is ever Forgiving and Merciful." (4:23)
Children of the same father but different mothers are Half Brothers or Half Sisters, as are children of the same mother but different fathers. If two people who each have children from a previous marriage marry each other, then their existing children are step brothers or step sisters to each other.