I sometime play a memory game with my far away DGs aged 4 and 6. Put 5 objects on a little tray e.g. lego man, felt pen, spoon, sweetie, photo...can be anything . Have them look carefully. They then close their eyes and you take one object away and move the objects around a bit ( or not, depending on age/ ability) They open their eyes,and guess correctly the missing object . You could use both French and English for the objects .Children love this kind of game. They can prepare a tray for you to guess at their end . You are lucky to have an hour regularly . We have a facetime about once a month at our request as we miss seeing them as they have just newly moved abroad . Ah well .