Wait with the building application because of the child construction allowance

That's it: The child must already be in the property at the time of acquisition. This means that if purchased without a child from 01.01.18 onwards, there is no [Baukindergeld].

Yes, I do. Here, the private school with accommodation costs just over 2,000 euros per month. If my tax burden were as low as in the USA, or even just 1,000 euros lower, my children would go there immediately.

Germany has the highest tax and levy burden worldwide. Some statistics place us "only" in second place, but they do not take into account quasi-taxes/levies such as GEZ and the Renewable Energy Act.

And are you sure about that? If you bought/built/inherited without children before, in my opinion, this does not matter. Because it is about the first purchase as a family. And family in the sense applicable here is: parents + at least one child.

I think the term "family" must be defined here. Wikipedia says that a family is already founded through marriage:

Family (collective formation from Latin famulus "servant", familia "entire household of servants") sociologically refers to a living community established through partnership, marriage, civil partnership, adoption, or descent,

Yes, that is correct.

Unfair or fair, I cannot say. I basically consider the [Baukindergeld] to be nonsense, but I am still happy about the extra money.

The same story with the holidays

You have to in Augsburg, there is one more than in the rest of Bavaria.

Can you see from the tax return that you rent out your property?

It is included in the tax return. V&V.

If you have always rented out the semi-detached house and lived in it yourself as a tenant, then the subsidy should be possible.

Only if the children attend the same facility. But since there are hardly any free spots here, I drive 4-5 children to 4-5 facilities (including schools) in the morning and there is no discount

In our city in NRW; siblings for free; OGS is taken into account.

Only the meal fee is due per little one.