H-4 Visa

1. My Son was born in February 2020 in the USA, where my wife is on an F1 visa working on OPT. Due to the Covid19 pandemic, I couldn't meet my son for two years. Kindly suggest to me the way forward to meet my son and wife. I also tried to travel on a tourist visa and F1 Visa. Unfortunately, I got both rejections. I'm an Indian taxpayer and an IT employee. 

2. My brother is a US citizen, and he applied for our mother's green card. Everything is clear, all paperwork is done, but due to the pandemic, we are waiting for the interview date from March 2021. Do you have any information on how we get the date or how much time it will take?

3. My daughter is in Dallas, US, and under medical treatment. She is there with an IN40 visa. As a father, I want to be there during her medical urgency. How can I get a visa now to be with her in the US?

4. I am a US citizen currently in India. I am traveling back to the States in mid-February for two months and want to take my Indian-citizen senior citizen mother with me for that duration. Her last US tourist visa expired eight years ago. (She has an active Schengen visa on her passport) Is there a way she can get a short-term two-month visa to the US?

5. I stayed outside of the US for more than two years because of COVID-19. Am I eligible for naturalization? I came to the USA in August 2016.

We are the parents of a minor (5 months) old U.S.Citizen daughter who is currently in India. We need to take our daughter to the U.S. for her 6-month vaccination doses. My H-1B visa and my spouse's H-4 visa need to be renewed, but unfortunately, there are no dropbox appointments available in any city. Is there a way an exemption can be made for our travel? I am a civil engineer who has built commercial facilities and will be building more commercial facilities in California, USA.