Why do my parents dislike my boyfriend?

Hi guys, so i am dating my current boyfriend for 4 years now. And he is going to meet my older brother who is like a father to me next week. The problem is I know he can come over a little harsh for the first impression. He likes to give short and simple answers. My brother is really oldschool and is going to ask a lot of old school questions like: How are you planning to take care of my sister are you financially stable? And my boyfriend does have a good job that pays him wel but not enough to pay everything on his own. We live in the netherlans and houses taxes are very expensive. And I know that he is going to give the answer that he works but expects me to work also to get trough our costs. I am aware of this, but my brother is the kind of man that thinks that a man is the man in house and even tho his wife does not want to work or can't he wil work is ass off to take care of everything. And I think he expects the same energy from him even though my boyfriend is very realistic and know that there are a lot of other resources from the government that can help instead of working your ass of on your own. So when i tell him that thats the energy my brother wants to hear. It feels like lying to him because its not how it is. My family expects also from him that he gives absolutely everything to give what that is needed. But my boyfriend is really straight about his budget. I know that that is a good thing to be honest but, I know that that kind of words does prove nothing to them and feels like he does not do he's best enough even tho i talked to him and know how is current situation is and does want to give what he can to make the wedding planning easy for us. I come frome a very rich culture our weddings are very expensive and he know that and tells me honestly what he can give and what not. But its really hard for me to convince the same to people like my family. What do i do when they dissaprove? Can you guys give me some advice

Why do my parents dislike my boyfriend?
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