Moths could be coming from two things, the wool (and alpaca) or grains in the kitchen. I've had the kitchen sort and they have never invaded the wool but I don't trust them!
For the kitchen clean out your cupboards, look in every flour, cereal box, oats, grain anything with some sort of grain/bread like product. You are looking for little cob webby things on the edges or lids and little worms (larva) in the food items. If you see any sign toss it. Also clean the cupboards, wipe them down, look on the top ceiling of the cupboards, and inside the upper lip of the cupboard where you can't normally see---I've found them in those unlooked at areas. Just a good cleaning will do the trick, don't have to use anything special. Any grains you think are good make sure they are in tight sealed containers, not plastic bags--the larva can chew through them particularly the cheap grocery ones from the bulk section. You might also consider storing flour and oats in the freezer.
For wool it is similar. Look through all your stash, you are looking for the same cob webby stuff and larva. If you see any toss it. Carefully check any yarn near any contaminated yarn and if it seems okay freeze it. Clean out storage areas completely, wipe down. Make sure when you re-store the yarn it's in tightly sealed containers.
If you have lots of wool clothes like your husbands pants clean the closets (and the mitten and scarf drawer) hand wash or dry clean any clothes where you think there might be a problem. Clean, clean, clean! I have heard that the moths are less attracted to clean items---thus a good reason to wash the winter mittens. And the cleaning gets rid of them.
Also if you get used yarn from others--freeze it for a few days before letting it live with your other yarn.
I have also read that one should freeze suspected yarn, then pull it out for a few day. If present, the moths think it's spring and start to hatch, then re-freeze, thus killing them before starting a new cycle.
Kill any moths you see about the house, they are tiny and light brown/ beige. But it's the larva that eat things.