Silicone isn’t what makes parchment paper heat-resistant (and isn’t even used on most standard parchment papers). Cellulose pulp is treated with sulfuric acid to cross-link the cellulose molecules, making them more chemically and thermally resistant, and the result is parchment paper.
I don’t know about firstest, but he was definitely firster. That’s why they call him a founding father, not a founding fathest.