車イス生活って英語でなんて言うの？

Some wheelchair users do refer to themselves as rollers, but generally it is impolite to refer to a wheelchair user as anything other than a wheelchair user. It is also very impolite to touch their wheelchairs as they are an individuals personal space and property.
You should not say they are disabled or wheelchair bound or anything like that as it is disrespectful. You should not make any assumptions about why they are in a wheelchair.

• She spends her life in a wheelchair*
  Meaning = she always needs a wheelchair if she wants to get around anywhere

To get around she has to use a wheelchair
Meaning= she cannot walk for some reason

She needs a wheelchair to get around
Meaning = she has to use a wheelchair because she cannot walk.

to get around
Meaning = to move around. To go down the street, to go to the shops- anywhere outside of her home.

You could also say:
She has a disability so needs to use a wheelchair
Meaning= she has an impairment/ condition which means she needs to use a wheelchair

• We need to go somewhere wheelchair friendly*
  Meaning= we have to go somewhere where there are ramps instead of stairs so wheelchairs can move freely around.

• The UK is wheelchair friendly*
  Meaning= the UK has lots of attractions, streets, cafes, restaurants, museums (general public places) where wheeldchair users can go.

My relative can't walk. - you can add more on to this for example "My relative can't walk far, so they use a wheel chair".
My relative is disabled - disabled carries a lot of conditions, however when you think of disabled you automatically think of the wheel chairs painted on a parking bay. So you associate disabled as being in a wheel chair.
My relative uses a wheelchair. - Simple and to the point. This tells people that your relative uses a wheel chair permanently.

If you are trying to explain to someone that someone you know lives their whole life in a wheelchair, you may say something like, "a relative of mine lives in a wheelchair." or another way of explaining to someone that a specific person is dependant/needs a wheelchair to live is to say "A relative of mine is wheelchair bound.".

Wheelchair user'
If someone uses a wheelchair, we can refer to them as a 'wheelchair user'.

We can use the adjective 'disabled' to refer to someone who may have a physical or mental condition that can limit their movement. We can use the noun 'disability' to say 'This person has a disability'.

Both of these phrases are used in the same way and talk about the necessity that someone needs to use a wheelchair to move around and be mobile.

Wheelchair - a movable chair mounted on large wheels which are used for disabled people. The first one underlines the importance of the wheelchair, whereas, the second one is just an explanation for how long she has been using the wheelchair.

Confined to = we use this form when talking about the restrictions that are placed on a person or thing.
"John was confined to his bedroom yesterday for coming home late."
To get about = to move around the place...the town, the local area, the country, the room.
"Old man Jenkins can't get around on his own anymore - he needs to be pushed in a wheelchair."
"Muriel has to use a wheelchair as her legs were paralysed following an unsuccessful operation."

Paraplegic (noun)
a person affected by paralysis of the legs and lower body

Paralysis (noun)
the loss of the ability to move (and sometimes to feel anything) in part or most of the body

Confined (adjective)
means to be restricted in area
_
A: We have to find a ramp
B: Why?
A: John is confined to a wheelchair and won't be able to make it up the stairs

A: My cousin is in a wheelchair.
B: What happened?
A: He was in an accident and now he is a paraplegic.

He/she - the person you are referring to
handicapped - having a condition that markedly restricts their ability to function physically, mentally, or socially
wheelchair - a chair fitted with wheels for use as a means of transport by a person who is unable to walk as a result of illness, injury, or disability

Example : My friend is handicapped and uses a wheelchair everyday.

A)She has been in a wheelchair all of her life.
Meaning of this sentence is the following -> She has never been without a wheelchair. / The wheelchair has always been apart of her life.

B)It is impossible for her to get around without her wheelchair.

Definitions :
Impossible -> not capable
Get around - move around.

Meaning of this sentence is the following -> It is not possible for her to move around without her wheelchair.

C) She has been dependent on her wheelchair ever since i can remember.

Definitions

Dependent - reliant on- Can not live without it.

Meaning of this sentence is the following ->She has been dependent on her wheelchair ever since i can remember. - She has been in a wheelchair all of her life.

If someone is wheelchair bound it means they are in a wheelchair all the time and are constantly attached to it. We also have the phrase housebound which describes someone who cannot go outside and has to stay indoors, usually because they cannot walk very well.

Wheelchair dependent means the person relies on a wheelchair to be able to move around. The word dependent can follow any thing that a person relies on.

E.g. Alcohol dependent - to be addicted to alcohol
Financially dependent - to rely on someone else to support them with money

These phrases explains to the listener that the relative relies on a wheelchair to get around in everyday life and it is important for their well being.

Wheelchair-bound means that he cannot move around without
his wheelchair.
He relies on a wheelchair means that he depends on his
wheelchair to help him get around.