The jumping comma is indeed the child question, as already mentioned several times above. You should first lay out the cards there. None, in 2 years, in 10 years? One every 2 years? Who stays at home? How long does he/she stay at home? In my opinion, the child question is the crucial point for your planning, for the salary – and thus also for the necessary equity.
And, somewhat off-topic: Are inquiries with average income and "larger" construction projects increasing at the moment? Or does it only seem that way to me? Or has the price just gone up again?
If all this is approved, with guarantees on parental homes, planned tax refunds, etc... Not that the banks accept all this and then skip out.