I can think of a few reasons:
Mom, needs a cover to go out an investigate who is up and what the heck is going on out there..."Beaver, get up, someone is is runnin' around the neighborhood and people are lookin' for her. Let's go see what the heck is going on...we'll pretend like we're walkin' Spot."
Or "Show me where you (or your brother or Dad...just fill in the appropriate blank) were (was)...So there was/were a girl/girls there? What did she look like...do you think it's the same girl? Let's go see if we can find her. I want to know what the heck is going on here and you are going with me. Let's go!"
Mom, needs a cover to go out an investigate who is up and what the heck is going on out there..."Beaver, get up, someone is is runnin' around the neighborhood and people are lookin' for her. Let's go see what the heck is going on...we'll pretend like we're walkin' Spot."
Or "Show me where you (or your brother or Dad...just fill in the appropriate blank) were (was)...So there was/were a girl/girls there? What did she look like...do you think it's the same girl? Let's go see if we can find her. I want to know what the heck is going on here and you are going with me. Let's go!"