Yes, call an exterminating company. There are certain types of chemicals used for the type of bug you want to get rid of. They know which ones to use, much more effective than those you get at the local store. Let them know your situation with the elderly person and they can help you figure out the best way to get rid of the bugs. I had to do this a few years ago for ants and spiders. The exterminator came once a month for three months in a row, and it worked. The cost was very reasonable, and worth it. We did have to leave the house for 4 to 6 hours, until it dried. After it dried it was safe for people or pets. If you try to exterminate them yourself, you will constantly be using poisonous sprays, smelling it, spending money each time to buy it, then they are still there...so to avoid all this stress, call a company. There should be improved ways to do this without leaving the house, if its not convenient for you to do so. Good luck!