Rudy's dad was a good father
I see lot of dislike from the PC snobs and rich silverspoon-fed millenials talking about Rudy's dad being a bad or "not nice" father. His character was a good father, he did a lot for his kids. Let's look at the storyline/background:
1. Rudy's dad's father lost everything in the great depression and abandoned the family. He had to live out of others people's houses.
2. He made something of himself working hard in a blue collar town at the refinery. Worked his way up and was able to provide a home and a decent life for his wife and numerous kids they had together.
3. He provided a job for his sons at the refinery right out of high school with a chance for them to move in the company especially being union.
4. The reason he wasn't a fan of Rudy's dream is cause it reminded him off his own father's dream and it failed and it ruined his family.
5. He was looking out for what's best for his kids being a hardworking blue collar man who came from nothing.
6. The moment he says the line at ND stadium is cause he is encapsulated in the moment being that he's dreamed of going to a game all his life plus it just so happens he's there with people he loves seeing one of his sons run out onto the field.
7. Blue collar men like him for the most part are hard/tough characters. A man of his character growing up a hard life is not going to be so PC. He's realistic.