Roosevelt, Franklin Delano. FDR Autograph Letter Signed As President, â€œPa,â€ to His Son. Single-page ALS on lined paper (5 x 8â€), dated Oct. 2 and signed â€œPaâ€ within the letter, written just before he embarked on the USS Houston to review Naval tactical exercises. Accompanied by the original hand-addressed Hotel Coronado (California) envelope to Mr. Franklin D Roosevelt Jr. at his address in Cambridge, Mass. Original mailing folds, scattered light stains. â€œDearest Brud / I shall miss you much on the grand old USS Houston â€“ we go aboard in a few hours â€“ there the Fleet exercises, thru Southward. Take care of yourself. If you can come to H.P. for Sunday Nov 3 it would be grand. Just so much love from / Your dearest / Paâ€.