Husband having an affair with his wife's niece

Q: My husband, 36, has been having an affair with my niece, 20, for the past few years. Everytime I confronted him he denied it and twists it around like I'm crazy and insecure. However yesterday I caught them redhanded in each others arms kissing, etc. What is the position of my nikah with him? We have 2 sons aged 16 & 14 and a daughter 11. My concern is custody of my children, should I choose to divorce. Please advice me of the way forward.

Eating at haraam outlets

Q: I study in China and I have a lot of difficulties in eating food and deciding between Halal and Haraam. I want to ask you to please clarify me somethings.

1. Can we eat chicken or beef at International Brands like KFC, McDonalds etc.? 

2. Are the flavored crisps like Lays BBQ flavor halal or haraam? Please help me in this regard.

Looking around in Salaah

Q: If a person looks around in Salaah, what will be the position of his Salaah, will it be makrooh or will it break? Kindly explain the different situations i.e. if he only turned his face to the right or left during Salaah, or he turned his chest as well, or he only looked from the corner of his eye. Will there be any difference in the ruling of the above situations if there was a need for him to look?

Divorced couple keeping each other informed via sms regarding the needs of their child

Q: Husband has issued one talaaq and wife is observing iddat. What is the ruling regarding informing each other about the child getting sick, needing to be taken to the doctor, etc. as these are matters that will be ongoing for life? Completely understood that they become complete strangers and no communication allowed, is it allowed to send an sms to prove the money was deposited into account, the child needed to go for tests, etc. to keep the parents informed about the child.

Being unable to locate the seller to return the defective item

Q: I've bought an item on eBay and after receiving the item, I requested a refund for the money because it was not as stated. The money was returned and according to eBay policy, the seller is to pay the shipping fee for the return. I've been trying to get in touch with the seller for almost two months now but they have not responded. I would like to know what I am to do with the item I had previously bought?

Using the nisaab of silver when calculating zakaat

Q: How to calculate the nisab of Zakaat in money? Should we take into consideration the nisab of silver or the nisab of gold? For information, in France, the price of one gram of silver was 0.63 euros in that month, and the price of gold was 40.15 euros. If one takes the nisab of silver to caluclate the nisab of goods in money, the amount is small. Would it be permissible to take into consideration the nisab of gold in this case presented? If it's possible, what would be the amount of nisab?