His father built a house with a riba-based loan. Should he get married in it?
Question

                My family want me to get married but I cannot afford it. They asked me to build a room within the walls of the house and I agreed to that, then after that I found out that this house was built with riba, as was the wall, so I refused. My father took this loan before he learned that this kind of loan is haraam. What advice can you offer to me and my father?.
Praise be to Allah.If your 
    father took this loan before he found out that it is haraam to take a 
    riba-based loan, then we ask Allaah to pardon him, but he has to repent to 
    Allaah for failing to seek essential knowledge and ask those who had 
    knowledge. There is no sin on you for living in this house and making use of 
    the room, but you should resolve not to engage in riba again, and to ask the 
    people of knowledge before entering into any financial transactions that are 
    common nowadays and which may involve kinds of haraam things of which many 
    people are unaware. 
The Standing 
    Committee for Issuing Fatwas was asked about a person who took out a 
    riba-based loan and built a house with it, and he is asking whether he 
    should demolish the house, although he took the loan not knowing that it was 
    haraam. 
They 
    replied: If the situation is as described, what you got from borrowing money 
    in this manner is haraam, because it is riba, and you have to repent and 
    pray for forgiveness for that, and regret what you did, and resolve not to 
    do anything like that again. As for the house which you built, do not 
    demolish it, rather benefit from it by living in it or otherwise, and we 
    hope that Allaah will pardon you for your mistake. End quote from Fataawa 
    al-Lajnah al-Daa’imah (13/411) 
We ask 
    Allaah to help you to get married and to make easy for you the means of 
    goodness and success. 
And Allaah 
    knows best.