Your mother's sister's children are your 1st cousins.
You're not related.
granduncle - grandnephews/grandnieces
Half-Sister Cousins
There is 2 answers your mothers brothers children or your dads sister;"s children
They would be great nieces or great nephews.
Your mothers sisters Granddaughter is your second cousin
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.
The relation of the mother;s sister to daughter is niece-aunts.
Your mothers sister is your Aunt
He is your second cousin once removed. His children are your third cousins.
uncle
What family members your is fathers mothers daughters sons sisters