How are family and wealth compatible?

I'm in my mid-20s and single and wondering how to build wealth with a family in the long term. It starts with finding someone who is on the same wavelength as you financially. Just thinking about people spending up to €100,000 on a wedding sends shivers down my spine. I don't even want to start with children. How do you finance the whole thing and build up assets at the same time? From a financial perspective, doesn't it make the most sense to just do it alone?