younger brother / junior male / I (modest word in letter)
弟
=
丷
+
弓
+
丨
+
丿
:
Mnemonic symbol: Jesse James, the younger one of the James brothers (弟).
A mean crocodile (丷) harasses Dorothy Gale (di) in the space station's bathroom (Ø4), but Jesse James (弟) is there to stop him. With a composite bow (弓), he shoots a banana (丿) as a warning shot; as the banana doesn't stop the crocodile, Jesse shoots a dinosaur bone (丨) right into the crocodile's crotch.
妹
=
女
+
未
:
Bessie Coleman, (女) her younger sister (妹), Mahatma Gandhi (m) and Ai Weiwei (未) are playing a game of Schafkopf in the Eiffel Tower's bathroom (ei4). Somehow Bessie and her sister always end up in the same team, which makes Mahatma Gandhi and Ai Weiwei very suspicious.