Wife not sure if husband divorced her

Q: If a husband denies and is ready to give oath about not divorcing his wife but the wife thinks that he has divorced her over the phone. She is confused as her husband is giving an oath and she too was very angry when she asked for divorce so she isn’t sure whether he said it or maybe she heard it wrong. Who should be believed, the husband or the wife?

Inheritance

Q: My father has passed away and left 1 wife and 3 daughters. His parents and all his sibling had passed away in his lifetime. My father has 2 nephews from his brothers.

I want to know that my father has 1 house, 1 car and 2 bank accounts. My father bought a house with a joint name with my mother and he orally gifted that house to my mother in his life and same goes with the bank account. One account belongs to my father and that account was his salary account and another account was a joint account he made for my mother's use. In that account he used to transfer some of his salary to my mother in a joint account for monthly expenses.

So my question is that is the joint house and account also part of the inheritance? People are saying that he has a joint name on that house that's why it is also distributed equally. But in the case of the house he gifted the whole house to my mother orally in front of his daughters and in the case of bank accounts he only operates his account for my mother's use only.

Gifting one's divorced daughter more than the other daughters

Q: I have four daughters. Three of them are married and the youngest one is a student. Out of all four, one married daughter was separated (got Khula) and is living with her parents (me and my wife) along with her daughter (my grand-daughter). Please guide me:

If I sell my house wherein we are living, can I gift 50% of the cost of the house to my seperated (Khulah yafta) daughter in my life?

Taking a fee for providing a service

Q: My husband knows some people who makes cards for work. They asked him to get people who want cards. If people go by themselves, they have to pay 80£ to do the test. If they fail the test they not going to get the card. But if you pay more, they can get the card for you without doing the test and you have to pay around 200£.

So my husband gets people and tells them it's 300£ for the cards. He takes them to get the cards and explains everything to them. He takes the money and pays 200£ to the people making the cards and takes 100£ for himself. Is this halal or is it a kind of riba?