Great-grands in Spanish

Hi,
I know that great-grandfather/mother is bisabuelo/a in Spanish, but what is the proper way for saying, for example, 3rd great-grandfather? Or third time great-grandfather? (GGG-grandfather) I'd like to send a message to a potential cousin and my limited spanish vocabulary doesn't reach that far. I wasn't able to find it in my spanish-english dictionary.
Google translate is suggesting: tres veces bisabuelo. Is that correct?
Thanks in advance!

Cindy (Barela) Fahrbach
email: genie_research@hotmail.com
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Researching: Banegas, Barela, Cutler,
De La O, Fahrbach, Jimenez, Keller,
May, Navarro, Starnes, Utley, Ybarra
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