So I think your property doesn’t sound too bad in terms of location. Does a school bus run? Are there decent bike paths available? Believe me, you don’t always want to play taxi for the kids.
Otherwise:
Check if your parents’ property can be divided and built on.
If yes, then you can start more detailed financing inquiries.
Clarify with your parents how the property will be transferred to you. I believe it can’t be done at zero euros.
Then start being eager that the child is there when the construction starts (ideally). Because pregnant, your wife can only be used on the construction site to a limited extent. And if you want to do some work yourselves, you will need her labor. Once the child is there, grandma can babysit (that’s what we did). Or you wait until you are in the house. But that can still take 2-3 years.
By the way, do not exclude a kindergarten from the cost planning too rigorously. If you get one like we did, you’ll make three crosses when the child is with a daycare provider at 10 months. You simply cannot keep every child at home until school age. You shouldn’t, for the child’s sake anyway. From 3 years on, every child belongs in a group to learn how to interact in a group.
Ü3 is by far not as expensive as U3, but costs still occur, as well as traveling to a daycare, and at the times the daycare decides.
That means the child has to be there by 9 a.m. at the latest and depending on the hours booked, picked up again by 4 or 5 p.m. The daycare doesn’t care if that is inconvenient for you because you work shifts.