A new run fixed the problem where mother wasn't properly lip synced, unlike the girl.

https://files.catbox.moe/4ee2j5.mp4

I'm not sure exactly how I fixed the problem, because I changed a couple of different things, and there's always the fact that there are random factors involved unless you lock down the seed (which I didn't).

When I added only "Make sure Mother's lips sync with <Audio 1>" to my prompt, the mother was then lip synched, but the daughter failed to speak at all. So I added "Make sure girl's lips sync with <Audio 2>" as well. But at the same time I additionally slightly trimmed both reference audio tracks too, each of which had been just a small fraction of a second over the allotted time for each. It might have been a timing issue that had thrown off the audio handling.

Since it seems there's always some unexpected rendering weirdness that has to happen, however, this run of the video didn't start with my specified start frame. The overall result is so good I didn't care too much. I'll run a few more iterations any way, and after that, I'd like to try to lengthen the video a bit beyond the 15 seconds where a single run maxes out.