Sir,
I have four children three sons and one daughter, two sons and a daughter are already settled in Germany. A son is working as a software engineer and the other is working in medicine company Merck and third son is also married in Germany, he has also applied for family reunion since 2 months, as his visa is granted, I and my husband will be alone here in pakistan, no one will be here to care us, as I had kidney transplanted since 3 years.

As I mentioned my 4th child is married in Germany and soon leaving for Germany, it will be difficult for me carry on my life alone. I need to much care and some time in emergency I have to visit health clinic my husband is also eye sight problem , he can not too help me in any emergency , I like to join my children in Germany , please guide me where to start the visa process.
1. I have to apply in German embassy as a first step or
2. I have to hire a lawyer to proceed the matter in the court as a first step

Please kindly guide for a while, I shall be very thankful to you.