First of all address it to the person in the family you know best (if they are a friend) otherwise address it to the direct next of kin as an individual (husband, wife or if both are dead then the oldest child).
In the card mention all the family - the person you sent it to will show the rest.
The people attending a funeral as friends or relatives of the deceased are called the mourners.
This is more religion question, not a funeral question. Check with the mosque in your area.
Some families include such information in the person's obituary. But if there is no address listed, a safe thing to do is address it to the entire family, using the deceased person's address. Contact the funeral director for advice.
Most people ride in cars to a funeral. Some may also opt for funeral processions or other modes of transportation depending on cultural or religious traditions.
I guess the deceased.
It's the car the carries the coffin with deceased individual in it to the funeral
It is normally the immediate family of the person that has died, such as parents, brothers and sisters, if there are no immediate relatives then it would be aunts, uncles cousins and so on, however it is up to the family arranging the funeral to decide who goes where. Indeed, the deceased may have already decided before they died by making their own funeral arrangements.
The right would be to the immediate family of the deceased person. As you are not legally married to the deceased person, then you will have little or no right. However, the deceased persons family may be happy for you to arrange things, however, you should always check with the deceased's relatives first to save any upset at what is a very sensitive time for all.
Friends and family of the deceased
Yes
I Believe The Gurdwara And The Relatives
Contact the funeral dIrector that handled the preparation of the deceased - all licensed funeral homes will have the necessary paperwork to do this.