Filing individually?

Hello,
We live in France, and I have not filed for 20 years. If I start now, I believe I can not file individually : I must mention wife, kids etc.

I seems too complex for me : my wife does not have a tax number. I do not want to declare her income, etc.

I also have a handicapped son who is 24 years old. If I declare him, will I have to now every year file for him as well? I am afraid of opening up too much paperwork.

My second son is 16, so he will soon also have to file?