Buying a two-family house, feasible?

He wants to sell and then continue living there as a tenant, he is 87 years old and has no direct heirs who want to take over the house.

I can hardly read this without reflexively thinking of a life annuity.

Parental allowance plus is, simply put, about one third of your wife's net income before the birth. How do you get 900 euros? I just want to spare you an unpleasant surprise; presumably, you have already properly informed yourself or are using a regulation I do not know.

Correct, I think someone didn't calculate correctly. 1500*60% over 24 months gives about 450€, unrealistic financing.

The EG is definitely not that high. She now has 1500 net? If you want 900€ EG over 2 years, she would have to get 1800€ EG calculated over 1 year, so 900 over 2 years. That can't be right, because that is the maximum possible EG and for that she would have had to earn significantly (!!) better before. With EG Plus, there is the possibility to re-enter part-time and still receive part of the EG, have you maybe planned that and come to these amounts?

You were quite mistaken with the 900€ over two years. For that, she would have had to earn about 2,800€ net over at least the last 12 months. If she was at 1,500€ net before, it is, as a predecessor wrote, rather 450€ per month.

Hold on! For the parental allowance calculation, the AVERAGE net salary is taken. Then roughly 67% of that. So if, for example, she still has a 13th salary with bonus payments, it can comfortably add up. If she then chooses only half the benefit (which I, by the way, would never do), then the 900 € works out. Advice from someone who has been through this twice: Take the full benefit for 1 year and divide it internally across the months accordingly. If your wife, for whatever reason, ends the parental leave early, the remaining parental allowance expires. You should also consider whether you want to take 2 months (or more).

So if she, for example, still has a 13th salary with bonus payments, then that can easily work out.

This interests me personally now: was that counted for you??
To my knowledge and research, unfortunately not:

"...
But special payments are excluded from the calculation. This was decided by the Federal Social Court on June 29, 2017 (B 10 EG 5/16 R). The reasoning was that it is calculated based on an average of the regularly monthly received salary in the assessment period. Usually, the current salaries in the twelve calendar months before the birth month of the child form the basis of the calculation.

Vacation or Christmas bonuses, which are granted only once each in the assessment period, do not belong to this current employment income. The Federal Social Court systematically refers to tax law: one-time payments are treated as other remuneration under wage tax law. The payment was made on an occasion-related basis here, once before the vacation period and once before Christmas.

Therefore, special payments do not increase the parental allowance. This becomes particularly noticeable with high special payments. That means, if Neumann received other remuneration in the assessment period, these do not increase the parental allowance."