DUDE ... if these were CO alarms going off (and a lot of new fire alarms are combination fire & CO detectors), then you need to get your family out of that house ASAP.
If you don't have a CO alarm, get one and install it immediately.
Well before your CO alarm goes off, you can be sick. Do NOT mess with CO poisoning, or the next stop for the family is the morgue.
The "groggy and weird" you talk about seriously concerns me.
Norovirus makes you feel like absolute shit. So does food poisoning. If it is those, you might be having a sympathetic reaction. Being around a house full of pukers all night can deinitely make you feel like you're coming down with whatever they got, even if you aren't. That you don't feel sick or have diarrhea yourself (which almost always proceded vomiting with norovirus & food poisoning) would seem to point to this.
The good news is if it's is norovirus or 99% of all food poisoning, everyone should be back to normal in 24-48 hours.
But again that the alarms were going off is of SERIOUS SERIOUS concern given the symptoms you describe.
my father in law said they are only smoke alarms, but how does he even know that?