Hi Bethany, I found these answers for you through google but your Dad has the exact figure I can't remember it
sourced from the NASA site
"There are two ways to think about the size of the earth with respect to the sun.
First, the Sun's diameter is about 100 times that of the Earth. So, you'd have to line up 100 Earth's end-to-end to stretch across the face of the sun.
The second way to think about it is your question: how many Earth's would fit inside the sun. Imagine the you had a big, round, fish-bowl and a bunch of marbles. Now imagine that the diameter of the fish bowl was 100x the diameter of the each marble. That way, 100 marbles would stretch end to end across the fish bowl. Now, how many marbles will fit in the fish bowl? This is like asking your question about the Earth and the Sun.
As it turns out, we can stretch the marbles across the fish bowl in three directions, up/down, in/out and left/right, and everywhere in between. So,to fill the bowl we would need 100x100x100 = 1,000,000 marbles. Or, about 1,000,000 Earths would fit inside the sun."
The second source listed states:
"Turning now to the sun and earth, the quickest answer to the question is to divide the volume of the sun by the volume of the earth, to find an answer of 1.3 million earths. Indeed, the sun is quite large. But, here we have only thought about the volume, which means: to fit this many earths, we will have to break them all up and crush them together to remove all of the extra spaces in between. If, instead, we decide to pack the earths carefully inside the sun without breaking any, then we will always be left with some extra spaces in between, as when stacking marbles or cannon balls. Nature has taught us the most efficient arrangement for such stacking. The atoms in metals like copper, silver and gold are packed in the best possible arrangement, something called "close packing". Even with this close packing, still about 26% of the space always goes to waste. So, in the end, we will only be able to fit about a million earths inside the sun. Keep in mind, though, that after all of this careful packing, all of these millions earths will quickly burn up into something called a plasma."