Is it permissible for the woman’s guardian to refuse to give her in marriage to someone who is compatible, because of some problems between the two families?
Question

                I would like to know if it is permissible for the parents to reject a guy for their daughter because the parents had some problems with the guys family 30yrs ago but the two families always maintained a good relationship between each other.And the guys family are religious they have a good status in the society the guy is also religious.
Praise be to Allah.
      The Muslims should put an end to all disputes among 
      themselves that may generate resentment and hatred. The believers are 
      brothers and Allah has enjoined reconciliation between believers who are 
      fighting. He also described them as brothers in the faith. 

    So they should try to forget this resentment, especially if 
    they have any measure of religious commitment, as it says in the question. 
    If the guardian hopes that this marriage may be a means of removing that 
    resentment and hatred, then he is enjoined to go ahead with arranging a 
    marriage for two reasons: 

    1.Because the woman has received 
    a proposal from a man who is compatible

    2.In order to try to deal with 
    the hostility (between the families).

    Al-Tirmidhi (1084) narrated that Abu Hurayrah (may Allah be 
    pleased with him) said: The Messenger of Allah (blessings and peace of Allah 
    be upon him) said: “If one of you receives a marriage proposal (for his 
    daughter or other female relative under his care) from one whose religious 
    commitment and good character are pleasing to you, then give (your daughter 
    or female relative) to him in marriage, for if you do not do that there will 
    be turmoil in the land and a great deal of mischief.”

    Classed as hasan by al-Albaani in Saheeh al-Tirmidhi. 

    But if the guardian fears that there will be a renewal of the 
    problems and that his daughter may be wronged and ill-treated by this 
    family, and they will not treat her kindly, then in this case it is 
    permissible for him to refuse this marriage, because the guardian is acting 
    in the interests of the one who is under his guardianship, and her interests 
    in this case are served by not marrying this man. 

    And Allah knows best.