Barrier-free single-family house floor plan for aging with parents' bedroom on the ground floor

Hello dear forum,

for now, it’s purely about the floor plan on the ground floor, I have been stuck on this for weeks. We would like to build barrier-free now and live directly on the ground floor so that the children have the first floor. Unfortunately, I absolutely cannot find any floor plans that fit this wish.
The consultant drew us a floor plan, but I find the solution with the master bathroom unhappy. In addition, the huge ground floor makes the upper floor accordingly large, where we don’t actually need that much space.
Maybe you have suggestions on how this could be solved better.

thanks in advance

Development plan/restrictions
approx. 650 sqm (33 wide, 22 deep) pure building land
no slope
number of floors 2
gable roof

Requirements of the clients
We don’t care about the exterior look at all
2 floors
no basement
2 adults & 2 children
office: home office
open architecture
modern construction
open kitchen, cooking island
6 dining seats
fireplace
garage, carport
pool
smart home
Kfw40+

House design
Who designed the plan:
-planner of a construction company

What do you particularly like? Why?
It is a floor plan and you can also recognize it.

What do you not like? Why?
Living area seems too small to me, 2 bathrooms unnecessary

Price estimate according to architect/planner: 480k
Personal price limit for the house, including equipment: 600k
favored heating technology: heat pump

First of all, may I ask how old you are? We also initially wanted to build for old age (43, 41 and 5) but eventually realized that we are building for now and not for 30 years from now. Barrier-free can also be tomorrow, due to an accident or never. It might be wiser to build in a way that living now and in the medium term is nice, and afterwards for the heirs. Having a huge house in old age is nonsense anyway. Just a thought.

We looked at a house last week with what we think is a well-designed floor plan. However, it had no upper floor, but it did have a full basement.

Addendum. I looked at the floor plan. And upfront, I am absolutely no floor plan expert, there are real professionals here.
My personal impression, however: for barrier-free living on the ground floor, everything seems way too small.
I would remove the walk-in closet; in the case of a need for barrier-free access, it should be unnecessary. Two toilets would also be a waste of space in that case, I would think. Removing these two rooms would immediately provide significantly more space for wheelchairs and such, with the same floor area.
By the way, how wide are the doors, meaning the actual door leaf measurements?

I know your challenges all too well! We had planned a ground floor with extensions and only built over the main body on the upper floor. But it didn’t look that convincing from the outside. We then put everything on hold. The floor plan just didn’t really catch on with us, Corona came. Since you don’t care about the appearance from the outside anyway, the topic of extensions would be an option. This year we started planning again: ground floor as a rectangle, upper floor built wall on wall, but with a knee wall, without a bay window, but with a gallery, i.e. an open space on the upper floor and a second technical room. This sustainably creates two separable residential units, which also differ significantly in square meters due to the planning. Upstairs mathematically 30 sqm less than downstairs. It suits us, but we also plan two private rooms on the upper floor, regardless of whether each is used by us for working or for hobbies or whatever.

Maybe you have suggestions on how to solve this better.

Only then build barrier-free and age-appropriate when it is necessary. Or are you already around 60? Everything else is nonsense in my opinion. I have different requirements in life – so I also build differently each time. The all-rounder doesn’t exist (or at least not for T€ 480).