Did I Just Experience a Glitch? Urgent

My Sim has three children, currently. Or, I should say three toddlers. His son is the eldest and then twin girls. For the first time in forever, I let my Sim give a concert Live, as opposed to sending him into a rabbit hole, (which keeps me at the house and able to care for the remaining Sims). There were three other adult Sims in the household, but sadly, we all know they don't take care of the babies and/or Toddlers, they barely take care of themselves! I took a risk. Well, the moment his concert was over, (and he was just across the neighborhood) I sent him home. Harmony was in the high chair, her mother standing right before it. Erik went to the fridge and grabbed food for Harmony. (I had actually sent him there to grab food for her twin, Melodie. Harmony just sat there unmoving. Mom was frozen in place as if she'd seen a ghost. I clicked on the food for Harmony to eat. Poof! In that instant Harmony was gone!. I checked the family's icons and hers was missing. So I scrolled down the entire list of messages.

Question: Does the Social Worker ever, ever, EVER, take a child/toddler out of the home A) Without notice and/or B ) without taking the others child/toddler(s) from the home?

Or, did I just experience a glitch?

I can't perceive of Melodie existing without Harmony, so I exited without saving.

Please, and thank you, in advance.