You and the children of your mother's first cousin's children are second cousins to each other. You have a great grandparent in common.
The children of your mother's first cousins are your second cousins.
The children of your mother's second cousins are your third cousins.
Half-Sister Cousins
Yes they were cousins on his mothers side
children,mothers and govoment
The last Czar, Nicholas II and King George V (the current Queen of Britain's grandfather) were 1st cousins; their mothers, Queen Alexandra of Britain and Empress Maria Feodorovna of Russia were sisters.
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.
Half-Sister Cousins
The children are both your cousins[uncle's children]and your nephew and niece[sister's children].
Hopefully, women who are grandmothers of the same children are friends, but in western culture they are not otherwise related. They are the mothers of the parents of the children
You are first cousin, once removed to the children of your great uncle.
Your mothers grandmothers children are each others siblings.
Their relationship is implied by statements involving the fact that their mothers are cousins.
2nd Cousin
Such a person would be your second cousin, and in most places marriage between second cousins is legal.
The concept of fractional blood relationships is obsolete, useless, and scientifically invalid. Nevertheless, if you must have a number you and your first cousins share two of four grandparents in common, so your fractional relationship is one half (½).
Your mother's first cousin's child is your second cousin. To your children this person is a second cousin once removed.
Your mothers hairy vagina
Your great cousins