Floor plan of a single-family house approximately 190m² and placement on the plot

You ruin your west garden with the garage/carport and it results in a fragmented garden.

[ATTACH alt="1656407814388.png"]72965[/ATTACH]

I would rather place a double garage/carport to the east, next to the utility room, then you have a nice contiguous garden.
[ATTACH alt="grundriss-efh-ca-190m-und-platzierung-auf-Grundstück-582601-1.png"]72966[/ATTACH]

Or put the house in the northwest corner and the garden towards the southeast. With a trapezoid-shaped garage/carport. Floor plan mirrored.
It’s a matter of taste whether it should face the street or the parents... I would probably choose option 3. I think you get the most sunlight and the most garden if you only build a single garage.

[ATTACH alt="grundriss-efh-ca-190m-und-platzierung-auf-Grundstück-582601-2.png"]72967[/ATTACH]

I also consider a floor plan discussion premature. First clarify the division and determine the buildable area. A building inquiry might be useful.

Variant 3 indeed creates the most and best garden. South/East garden means sun in the morning and during the day and then shade in the evening, right?

South/East garden is then tomorrow during the day sun and in the evening shade, right?
Although there is also space in the west for an "evening sun terrace".