Old dogs bark a lot during the day. Any advice?

I have two small dogs that bark a lot during the day. One is 16 y/o and the other is 14 y/o.  They were my family's dogs when I was younger but I recently brought them up because my parents are too old to take care of them. Our current neighbor is retired and has complained to us twice that our dogs bark a lot during the day while my husband and I are at work. 
Do you have any advice on how to get older dogs to stop barking? I really stressed which is impacting my efforts to conceive! 
Thanks I'm advance! 🙏 
A little more background:
I adopted my first dog when I was 12 (the now 16 y/o). My older sister adopted the second dog and gifted her as a pet to my mother. 
I trained them fairly well. They never barked at strangers or outside noises. In general, they were very well behaved. When I went off to college, my parents were the dogs main caretakers. After I moved back home for a while after graduating, I noticed the pups barked at EVERYTHING. My mom encouraged their barking. I tried my best to correct them but as my mom too care of them when I went to work during the day, my corrections didn't make a lasting impact. 
Now my first pup is deaf and doesn't respond that well to my vocal commands.