Who is the attacker in this relationship?

While uncle and nephew were butting heads, Rui Fei who had been lost in thought was suddenly startled when he realised he was no longer walking alone. To his right was Rui Li playfully twirling her pigtail around her finger and on his left was Rui Yewan who was abashedly swinging his hands like a shy high schooler. He had been too distracted right now that he didn't notice immediately that he wasn't walking alone anymore.

So what sort of relationship did he have with his brother and sister in law? One was obsessed with Ji Yao's relationship with Rui Fei like a crazy fanatic who would get into a physical fight with anyone who attempts to sink her ship.

The other was reserved though he secretly wished he could be fully accepted into the boys club and be invited to meetings concerning their missions. Which little brother doesn't look up to his older brother and secretly wants to be a part of his older brother's gang of friends, right?