Your grandma and their grandparent was 1st cousins( child of their grandparent is 1st cousin once removed), one parent of your grandmother/their grandparent were siblings
So your common blood ancestors was your great great grandparents who are their great great great grandparents meaning you/they are 3rd cousins 1 time removed
You know something this can go two different directions. First cousin once removed can be one of your grandmother's parent's first cousin or a he/she could be an offspring of one of your grandmother's first cousin. So, more information is needed. Ted Pack or Maxi where are you?
Your 2nd cousin. The children of 1st cousins are 2nd cousins. Your grandmothers 1st cousin once removed is the child of her 1st cousin. You are the child of a first cousin(your grandmother). Because you are both the children of 1st cousins, you are 2nd cousins. The child of your 2nd cousin would be your second cousin once removed. The child of your second cousin once removed would be your second cousin twice removed.
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Verified answer
Removeds go up and down.
If Cousin in Question (CiQ) is your grandmother's parent's first cousin (that would be your great grandparent's first cousin), then CiQ is
Your grandmother's 1C1R
Your parent's 1C2R
Your 1C3R
If CiQ is the child of your grandmother's first cousin, then CiQ is
Your parent's 2C
Your 2C1R
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Edit 1: "2C1R" is how we abbreviate "2nd cousin once removed". The other abbreviations follow the pattern; degree, then removeds.
Edit 2: Maxi, I think that if you work it out one generation at a time it will be easier.
You're 2 generations down the line from your grandmother, so you're first cousins twice removed.
Your grandma and their grandparent was 1st cousins( child of their grandparent is 1st cousin once removed), one parent of your grandmother/their grandparent were siblings
So your common blood ancestors was your great great grandparents who are their great great great grandparents meaning you/they are 3rd cousins 1 time removed
You know something this can go two different directions. First cousin once removed can be one of your grandmother's parent's first cousin or a he/she could be an offspring of one of your grandmother's first cousin. So, more information is needed. Ted Pack or Maxi where are you?
Your 2nd cousin. The children of 1st cousins are 2nd cousins. Your grandmothers 1st cousin once removed is the child of her 1st cousin. You are the child of a first cousin(your grandmother). Because you are both the children of 1st cousins, you are 2nd cousins. The child of your 2nd cousin would be your second cousin once removed. The child of your second cousin once removed would be your second cousin twice removed.
Either a first cousin twice removed or second cousin twice removed.
A stranger