I don’t know much about him but he is in just about every family tree I have. He has many, many descendants or people who claim to be.
Make sure you have the correct Charles. He had to specify himself as “Charles Carroll OF CARROLLTON” to distinguish himself from his contemporary cousin, who replaced him in Congress.
He was the last surviving member of the Signers (he did not vote on it, having just been sent the very day it was signed by Hancock), and he laid the stone of the B&O Railroad in 1828.