Pair of old lithographs

Two 19th century lithographs of a boy and a girl, perhaps brother and sister, respectively named emil and louischen, published by a felgner of berlin emil frame in black painted wood under plastic protection: 35x48cm lithograph 38.5x25.5cm louischen frame in black painted wood under glass: 39.5x48cm lithograph 38.5x30cm adorable pairs in the german style of the time.