How many grandparents????

Wait...I just thought of something,

If we all have at some point 4 grandparents at least, regardless whether they are alive.

Our parents both had 4 grandparents aswel, meaning we have 8 great grandparents,

Then 16 great great grandparents

Then 32 great great great grandparents

....damn, that's crazy when you think of as ancestors are your specific family line