I have finished it.
I send it out so I have a slight time advantage.
I had solved about half of the clues when I sent it to syzygy.
It looks tough but it isn't.
On my second try, I got the right quadrants.
I did not like clues at 2c and 3b.
I have no idea about 'sister' in 4c but the answer is easy to figure out.
Speedy solving!