Nikaah after divorce

Q: I am divorced and have two children. I had a court marriage in Pakistan but the nikah is not registered online. My husband told me not to tell the imam I am divorced because I didn’t have divorce papers and they needed proof. So I didn’t tell the imam I’m divorced and he wrote that I am a virgin on the papers. Is the nikah valid? I am from UK and my husband is in Pakistan.

Taking a salary from a person who took out an interest-bearing loan

Q: I am a student. I teach my aunts son mathematics. This is my first job as a student. I always wanted to earn halaal or I have a wish that my first salary or income will be atleast halaal.

My question is, somehow, I know that my aunts source of income comes from riba or a bank loan or something or fraudness which is haraam. Is my salary halaal or haraam? I am confused. Please explain, if it is not halaal then I will teach him for free.