Hm. You have 32,000 EUR equity, child 2 is on the way and you want to set aside 20,000 EUR by 2026, even though the woman will then be on parental leave and you have to finance one more child... If that works... why do you then only have 40,000 EUR equity?
Much more important is: You buy the house, move in and don't have to do anything? No new furniture, no fresh paint on the walls, etc? Move not through a company? You can easily spend 10, 15,000 EUR when furnishing a house, you will surely expand?
What kind of installment do you get with 100% financing and 460,000 Schurken? According to the rule of thumb, you should have a 2,600 EUR installment with 6,500 EUR net, leaving 3,600 EUR to live on. With 2 children, there is not much left to save for later renovations in the mid five-digit range...