 It is from her old lifeguard boyfriend, whose name begins with an M, who writes that if Mona replies to the letter, she has chosen him, and if she does not, she is choosing to stick with her husband, Abe, and that either way, he knows the baby she is carrying is his.Wondering who his biological father really is, Homer goes to the library to look in "Lifeguards of Springfield in the Twentieth Century.