The Wikipedia link suggests that Lord Randolph Churchill (1849-1874) was indeed Winston Churchill's father. However, the quote you provided about "extensive loans" from Nathan Rothschild and his involvement with the Rothschilds seems to be unrelated to Lord Randolph Churchill. This might imply that the statement is referring to someone else or a different topic.

Therefore, I would decide that:

"Prolly nothing" is indeed correct in this case!