The father of a father is a grandfather, a grandfather's father is a great-grandfather, a great-grandfather's father is a great-great-grandfather, but no word has been decided upon for the generations before great-great-grandfather.
El padre del padre es el abuelo, el padre del abuelo es el bisabuelo, el padre del bisabuelo es el tatarabuelo, pero no se ha definido una palabra para las generaciones anteriores al tatarabuelo.