When my son was young...(almost 3) He had just about out grown his diapers. Back then they didn't have all the sizes they have now.
I told him he had to start going on the potty because the diapers were getting to small, and he flat out told me NO! Well I stuck him in training pants (Cloth ones) I told him go in those all you want no more diapers.... I never got mad. I never yelled. I just let him decide he wanted to be potty trained. it didn't tale long before he wanted dry pants.
I know this is way different from a dog. But maybe you need to get those doggie diapers to keep the mess from being to big a mess.... And no more being upset with the dog. Maybe your family shouldn't be cleaning your puppy up if they are being mad and making him fell bad. Yelling and being upset will not help this. If you lived alone, there would be no one to clean up till you got home. Try the diapers and tell your family to not clean him up unless they can be good to your dog in the process... I'm sure this will get better.... Your baby is confused.
The other thing you could do is just potty out side. Potty needs to be potty and that is the only place they go! I read this and it seems to make sense. Sadie holds it in when she is in her expen even though she doesn't have to. She is 18 weeks. I guess once they know to hold it they can!
She still goes on my floor if I'm not watching but not in the expen.