How meney seats are on the flight 747 aircraft on delta?

Boeing manufactured several different 747's. Here is what I found online:

747-100/200 - Flight crew of three (two pilots and flight engineer). Seating arrangements include 397 in three classes, 452 in two classes (32 first & 420 economy), all economy seating for 447 nine abreast or up to 500 ten abreast.

747-300 - Flight crew of three, with two pilots and one flight engineer. Typical two class seating arrangement for 470 (50 business class including 28 on the upper deck and 370 economy class).

747-400 - Flight crew of two. Typical three class seating for 416 (23 first, 78 business and 315 economy class).

747-400 Domestic - Two class seating for 568 (24 first and 544 economy).

747-400 Combi - 266 three class passengers.

I'm sure that any one of these should accommodate your entire family. :-)