It's a mom thing

Me: "E, why are these toys back in my purse?"
E: "I found them in my room."
Me: "Right. That's where I put them after I took them out of my purse."
E: "I thought that was an accident."
Me: "No, I don't want them in here."
E: "But I like them there. If we go somewhere and I get bored, it's good for you to have them."
Me: "So why don't you bring them if we're going somewhere?"
E: "I don't think about stuff like that."
Me: "I don't want all of this stuff weighing down my purse. It's heavy."
E: "It's a mom thing. I count on you for that."