I find the movie "Mosly" a bit disappointing and some parts give viewers a course or path to expect but it didn't happen. First, in the line "we are also your family". I thought Mosley will have a journey freeing all their kind from the hands of humans but that wasn't shown in the movie nor any part where he'll say to his family "let's free everyone". Second, when he said "it was you all along" to those fireflies and showed precious memories when it helped them, it didn't give us any answers as who the he's referring to.
Overall, it's like I've watched a movie where you'll see a 4 legged creature ate a violet colored apple and be able to stand and use hands.