Buying stock from a Muslim who sells lotto tickets

Q: A Muslim shop owner buys stock i.e. cigarettes, cold drink, etc. from another Muslim but the person they are buying stock from is selling lotto tickets or gambling vouchers. The Muslim shop owner wants to know if they buy stock from the other Muslim owner that sells gambling vouchers or lotto tickets, would the stock they buy, as well as the income be halaal or haraam?

Paying fidya for one's deceased parents if they did not make a bequest

Q:

1. My parents passed away when I was a minor. My mother was shot when I was 2 years old and my father was shot when I was 6 years old. Does that make both of them shaheed?

2. I'm unaware of any qadha salaahs or fast if they had any. I was told that my father used to cover up qadha salaahs, I'm not sure if he completed it. What must I do on behalf of them? I would have estimated how many salaahs and fasts they had from the age of their puberty till demise and paid for every salaah and fast but I'm not a wealthy person. I dont know if I should give kafaarah on their behalf for any qadha salaah and fasts and how much I need to pay for them both as I am unaware of the amount of qadha salaahs or fasts for them both. What must I do?