Who was precival Tweedie and why was he important?

Johnny meets Mr. Percival Tweedie, the man Mr. Lapham has hired as an assistant. As part of the contract, Mr. Tweedie will get to marry one of the Lapham daughters, but he cannot decide which one. He likes to show up at the Lapham house for free meals, even when he is not invited. Johnny tries to warn Mrs. Lapham that Mr. Tweedie is no good. However, he does so in a rude way and Mrs. Lapham cuffs him. For the past few weeks, Johnny’s clothing and his arrogant attitude have made Mrs. Lapham suspect he is up to no good.