Welcome to the forum, Carol
I am glad to help you if I can do any.
These flags are souvenir flags sold at Yunoki Station in Sasebo City after the war was over.
There was a POW camp in Yunoki district till April, 1944 and 53 Allied prisoners died there.
I think your father visited Yunoki for memorial and purchased these flags as souvenir for his family.
Reading letters on the flags.
#1
長崎 東京 九洲 岡島勝己 Nagasaki Tokyo Kyusyu (Mr.)Katsumi Okajima
日本 松永 柚木 池野 Japan (Family names) Matsunaga, Yuki, Ikeno
筒井千代子 (Ms.)Chiyoko Tsutsui
佐世保 上田智恵子 松下君枝 Sasebo (Ms.)Chieko Ueda (Ms.)Kimie Matsushita
柚木驛長 Station master of Yunoki Station (Rubber stamp for Authentication)
#2
祈武運長久 Praying Good Fortune in Battle
中西米治郎 (Mr.)Yonejiro Nakanishi
左石驛 佐田保輝 Hidari-ishi Station (Mr.)Yasuteru Sada
柚木驛 松下君枝 Yunoki Station (Ms.)Kimie Matsushita