I am related to Lillian Gish...?

but I never really did any research on her..she's like a great, great aunt or something...Is any of her immediate family still alive? How would I find out?
Update: I never researched her because I never had any interest..but now I have my own family and my children saw a movie with her...they want to know how they are related. My family tree dates back to Matthias Gisch 1710 - 1757 and that is how I know I am related to her..because he is also part of her own family tree.
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