Hello,
If punctuation doesn't fully help, here's some other ideas:
Children and people not paying attention only hear the last thing you said.
So when you say, "Don't run in the house", they probably heard "run in the house"
Having some header text to get their attention, with the meat of what's important at the end helps.
You've got "Mom" in your example, but that might be too short. Try "Hey mom! This is your reminder to Let the Cat Out"
This gives the brain some time to realize somebody's talking to them, and that front half of the text isn't important if they miss half of it. By the time they swivel around to pay attention, the Content portion of the message should be coming on.
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