Hajj with Haraam money

Q: Is a hajj that is performed by someone who's money is 100% haraam from selling drugs accepted, the person is a drug dealer. When the person is on Arafat is all his sins also forgiven when returning as a Hajji. Please give a detial explanation & what is the punishment.

Fasting on Mondays

Q: An Aalim says: Traditional Eid-e-Milad-Un-nabi is Bid'ah. It is not Islamically right. But, it is true that Rasulullah (Sallallahu Alayhi Wasallam) himself celebrates the days Modays keeping Fast since it was his birth day, day of Hijrat, day of getting Nabuwat etc. I would like to know, if it is correct and if so, can we keep fast on Mondays like our prophet (Sallallahu Alayhi Wasallam)?

My father in-law is a Qaadiyaani

Q: I am Alhamdulillah married and my wife's father is a qaadiyani. However, I am not too sure what type of qaadiyaani he is. I know he does not believe in the fool Mirza being a prophet but I think he does believe in him being the Mehdi, even this I am not to sure about. If not then he just gives some standing to him. My mother in law is a sunni muslim, how they came about getting married is because they are 1st cousins so I don't think much attention was given, the family is not well linked with Ulamas etc. At first I was not too sure how deep my wife's father was in qaadiyaanism. Initially my thinking was because his siblings were all qadiyanis he had some weakness towards it and just said he is a qaadiyani because from what I know he practices Islam the sunni way and talks very highly of prophet Muhammad (Sallallahu Alayhi Wasallam). But my mother in law came over (they live in Canada, I am in the UK) and I finally got the courage to ask her a few questions about my wife's father and from there I have become skeptical and now I am not too sure how deep his belief is. He does on occasions like Eid pray behind their Imaam but again it is because all his family are there. I was introduced to my wife so I don't know the family too well, however neither did my wife know her father had these type of beliefs as her mother always brought her up in sunni Islam.

Here are my questions:

  1. Is he a Kaafir?
  2. If my mother in law believes him to be a Muslim does she stay in the fold of Islaam?
  3. My In laws are very kind to me so what sort of relationship should I keep with them?
  4. Its difficult for me to ignore him out but I am beginning to feel some serious hatred if his belief is kufr, should I still go visit them in Canada?
  5. How should my wife's relationship be with her parents?