This means that your great, great, great great, great, great — with about five million "greats" in there — grandmother was probably the same great, great, great, great grandmother with five million "greats" in there as Holly up here.
Esto significa que su tátara, tátara, tátara, — más o menos cinco millones de "tátaras" — abuela, fue probablemente la misma tátara, tátara, tátara, tátara abuela con cinco millones de "tátaras" que la de Holly.