血緣關係

血 = 丶 + 皿 : Mnemonic symbol: blood transfusion.

Xu Xian hurt himself and needs to get a blood transfusion in the elevator's bathroom. He found a petal leaf as donor, which is bleeding droplets into a bowl; Xu Xian gets the blood from the bowl as infusion using some tubes.

缘 = 彖 + 纟 : Yu the Great (yu) is foreseeing the silkworm's (纟) future in the anthill's kitchen (an2) using the Book of Changes (彖). The book says that the silk worm has great karma (缘) and will lead a long and fulfilled life.

关 = 丷 + 天 : A mean crocodile (丷) is chasing Gitta Giraffe (gu) in front of the anthill (an1). It almost caught up, when an angel (天) appears and pushes its off button (mnemonic symbol for 关) to save Gitta Giraffe.

系 = 丿 + 糸 : Mnemonic symbol: As this is the second character in 关系 (guanxi), I'll use shaking hands as the symbol for 系.

系 = 丿 + 糸 : In the space station's bathroom, Marie Curie found a new binding mechanism in chemistry. To demonstrate her findings, she binds two bananas together with a silk scarf. She celebrates her findings by shaking her own hand over her head.