Permissible and Impermissible employment

Q: 

1. If all of a person's income is haraam, can you accept a gift of dawat from such a person (i.e. you are sure that he has no halaal wealth or income)? 

2. Can you work for such a person? The work you are doing for him is of a halaal nature, but he is going to pay you your salary from haraam money. 

3. If such a wishes to purchase something from you and you are certain that the money he is paying with haraam money, will it be permissible to sell to him? 

4. Will there be any difference in the ruling if the person (whose income is haraam) is a non-Muslim?

Q: I would like advice regarding the following: 

My father works in the bank and it's his only source of income. After finding out that interest is war with Allah Ta'ala, I decided to find a job and move out. 

My question is, now that I have a job and moved out, all the stuff that were bought for me by my father what do I do with it? Do I give it away or can I still use it? My clothing, I have tools my father bought and basically everything I have is from my father, what do I do?

Q: Is it permissible for a tailor/dressmaker to alter clothing of non-Muslims? 

For example if a Hindu brings a sari to alter for Diwali or a Christian tells the tailor that they need the clothes altered for Christmas, will it be permissible for the tailor to do this job?

Q: My father is a Muslim. He got a job offer by a non-muslim to come and work for him. My father is a blockman in a butchery. He cuts meat and so forth, but this person works with pork meat etc. Will it be permissible for my father to work for him even though my father does not consume their food etc.?

Q: I work in an audit firm. One of the clients we have is a retail supermarket with over 25 companies/branches. 1 of the companies is selling alcohol. 

1. Please advise if we can do the audit of such a company? 

2. If not permissible but the audit was done previously, what must be done with the audit fee?

Q: I recently started learning how to do balloon decorations and someone asked me to make some decor for their birthday party and my mom agreed without me giving consent first. 

I am well aware that we are not allowed to celebrate birthdays and I do NOT intend on celebrating nor attending this birthday party. Am I allowed to make the balloon decorations for this person with the intention of not celebrating with them?

Q: I want to ask about earnings from food delivery services in a non Muslim country/community. Uber Eats, Door Dash are the delivery service name. 

The delivery is not containing any alcohol, etc. but sometimes some foods containing pork products. Either cooked or sometimes grocery items contain bacon, pork products, etc. Are the earnings halal or permissible by a Muslim?

Q: 

1. A lesbian woman approaches a Muslim notary to draw up an Antenuptial contract for a civil union with another woman. 

2. A person who is openly gay/lesbian approaches a Muslim lawyer to do work for them. The work doesn't have to do with the client being gay/lesbian. It is normal legal work. 

In either of these scenarios, is it permissible for the notary/lawyer to do the work?

Q: In a democratic government, which types of jobs, taxes, and educational activities are permissible for a Muslim to participate in, and which ones are not allowed according to Islamic teachings?