She wants to marry a man who had cancer and her parents refuse
Question

                I am interested in marrying a man who has a history of childhood cancer. He has been cancer-free for 7 years (since when he was first diagnosed), is perfectly healthy now, not on any medications and lives a normal life. The doctors have given him the clear and have declared him completely cured. However, my parents are completely against this marriage because they believe he can have a relapse. He is the most wonderful and Godfearing human being I know and I strongly believe that life, death and health is in Allahs hands and no body can predict the future for even healthy people. Please kindly advise how I can convince my parents to agree to this marriage.
Praise be to Allah.
    There is nothing wrong with marrying someone who had cancer 
    then recovered; in fact there is nothing wrong with marrying a person who 
    has cancer, so long as the woman agrees to that. 

    There are many people whom Allah tests with sickness in 
    childhood, then He heals them and blesses them, so a proposal should not be 
    rejected because of that, so long as the person is a righteous Muslim. The 
    Prophet (blessings and peace of Allah be upon him) said: 
    “If there comes to you one 
    whose religious commitment and attitude pleases you, then marry [your 
    female relative who is under your care] to him, 
    for if you do not do that, there will be tribulation on earth and much 
    corruption.” Narrated by at-Tirmidhi (1084) 
    from the hadeeth of Abu Hurayrah; classed as hasan by al-Albaani in 
    Saheeh at-Tirmidhi. 

    If the suitor is acceptable in terms of religious commitment 
    and character, and Allah has healed him of this sickness, and his condition 
    is stable according to the testimony of the doctors, then he should not be 
    rejected. 

    Based on that, try to convince your parents of it. Then if 
    they insist on their attitude, be patient, and accept it and try to find 
    excuses for them, because they are only seeking your happiness and 
    well-being. 

    We ask Allah to guide you and help you. 

    And Allah knows best.