My childrens father ... yelling at them..

Hey so I have a 3 year old and 2 year old. I know our hands our full right lol. I'm pregnant with #3. We both work full time jobs. I know work can be tiring and you just want to come home and relax but my kids act like animals when we get home. Full of energy and excitement. Well lately he has been yelling at them for I'll say plain old "being kids." He is an only child and never been around kids. But he will tell them not to do something and when they do it again he yells at them angrily and scary and puts them on time out. It got to the point the last 2 days I feel like its getting out of control. He been lashing out at them in frustration. So I finally decided to tell him how I feel. I said " I dont think your setting a good example for them by yelling at them. They are small kids who dont understand things yet. " he is like but I tell them so many times. And I'm like well that's part of the job, they don't listen but yelling at them isnt helping. He kept quiet and I didnt say more. It's a little scary going head to head about parenting styles but from this point on if I see it again I'm definitely nipping it in the bud right away. I just dont want the kids to see me going against him and think mommy is the way out. How can we talk about this without offending him and coming up with a clear solution on how to discipline them. I talk to them . I do put them on time out for a few minutes but not to the point they are crying ready to throw up because they are so upset. I need some advice. We been together 5 years and this is still all new to us.