~The rain is because they were raised in Amegakure, which kind of explains itself.
~Konoha gloves because Konoha
~They hold their umbrellas like that to protect each other from the downpour. Since they are the only family they have left (that they care about), they do what they can to protect each other. Even the simplest of things.
~That cat raincoat is what Kumiko was wearing when she witnessed her father's death.
~Same thing with Akihiko's raincoat.
~Akihiko is eating
Daifuku, because he has a sweet tooth. All you have to do is look in their fridge and you'll see just how bad it is.
~Kumiko's scarf is blue because
Blue is the color of the Virgin Mary, and is associated with girls who have similar pure qualities. Blue usually indicates femininity, life, purity, etc., just as water does. Please keep in mind is that Kumiko's first Chakra element is water, as well. :3
~Akihiko's scarf is also blue because
Blue can also symbolize peace, calm, stability, security, loyalty, sky, water, cold, technology, and depression. Maybe that's why he barely smiles. <.<
~It's night time because it was a "Dark and stormy night" that their daddy died. Huehuehuehueh
~The necklace around Akihiko's hand is the necklace he wears around his neck that used to be worn by his father.