Is it permissible to bury the husband with his wife in one grave?
Question

                Is it permissible to bury the husband with his wife in the same grave?.
Praise be to Allah.The majority of Shaafa’i 
    fuqaha’ are of the view – which is also the view of the Hanbalis – that it 
    is not permissible to bury more than one person in a grave, except in cases 
    of necessity, such as when large numbers have been killed, or there has been 
    an epidemic, a fire or drowning and it is too difficult to bury each person 
    in a separate grave. In that case it is permissible to bury two or three in 
    a single grave. A man should not be buried with a woman except in cases of 
    extreme necessity, and a barrier of earth should be placed between them in 
    that case. 
This is indicated by the 
    report narrated by al-Bukhaari (1343) from Jaabir ibn ‘Abd-Allaah (may 
    Allaah be pleased with him) who said: The Prophet  (peace and blessings 
    of Allaah be upon him) wrapped two men of those slain at Uhud in a single 
    cloth, then he said: “Which of them had more knowledge of Qur'aan?” When one 
    of them was pointed out to him, he put him in the lahd (niche) first, and he 
    said: “I will be a witness for them on the Day of Resurrection.” And he 
    ordered that they be buried with their blood (wounds) and that they not be 
    washed or the funeral prayer be offered for them. 
It was narrated by 
    al-Nasaa’i (2010), al-Tirmidhi (1713) and Abu Dawood (3215) that Hishaam ibn 
    ‘Aamir said: We complained to the Messenger of Allaah  (peace and 
    blessings of Allaah be upon him) on the day of Uhud and said: O Messenger of 
    Allaah, it is too hard for us to dig a grave for every man. The Messenger of 
    Allaah  (peace and blessings of Allaah be upon him) said: “Dig graves 
    and make them deep, and dig them well, and put two or three men in each 
    grave.” 
They said: Who should we 
    put first, O Messenger of Allaah? He said: “Put the one who knew more 
    Qur'aan first.” He (the narrator) said: My father was the third of three in 
    a single grave. 
This hadeeth was classed as 
    saheeh by al-Albaani in Saheeh al-Nasaa’i. 
Al-Nawawi (may Allaah have 
    mercy on him) said in al-Majmoo’ (5/247): It is not permissible to 
    bury two men or two women in a single grave except in cases of necessity. 
    Similarly, al-Sarkhasi stated that it is not permissible. The view of the 
    majority is that two people should not be buried in one grave, as it says in
    al-Musannaf. A number of scholars stated that it is mustahabb not to 
    bury two people in one grave, but if there is a case of necessity such as a 
    large number of people who have been killed or who died in an epidemic or as 
    the result of a building collapse or drowning, etc, and it is too hard to 
    bury each one in a separate grave, then it is permissible to bury two or 
    three or more in one grave, as dictated by necessity, because of the hadeeth 
    quoted above. Our companions said: In that case the best of them should be 
    placed closest to the qiblah, and if a man, woman and child are buried 
    together, the man should be placed closest to the qiblah, then the child, 
    then the hermaphrodite, then the woman. Our companions said: The father 
    should be placed before the son, even if the son was better, out of respect 
    to the father, and the mother should be placed before the daughter. It is 
    not permissible to put a man and a woman in the same grave unless there is 
    definitely a case of necessity, and in that case a barrier of dirt should be 
    put to separate them, and there is no difference of scholarly opinion on 
    this point. The man should be put closest to the qiblah even if he is her 
    son.  
Some scholars are of the 
    view that more than one person may be buried in a single grave, and that it 
    is only makrooh. This is the view of the Maalikis and was mentioned in one 
    report from Ahmad. It was also the view favoured by Shaykh al-Islam Ibn 
    Taymiyah (may Allaah have mercy on him). See al-Insaaf (2/551); 
    Sharh al-Kharashi (2/134). 
Others were of the view 
    that it is not makrooh, but they said that it should be rejected in favour 
    of that which is better.  
Shaykh Ibn ‘Uthaymeen (may 
    Allaah have mercy on him) said: The correct view in my opinion – and Allaah 
    knows best – is the middle view, which is that it is makrooh, as stated by 
    Shaykh al-Islam Ibn Taymiyah. Otherwise, if the first person has been buried 
    and is settled in his grave, then he has more right to it, and in that case 
    a second person should not be introduced to the grave, except in cases of 
    extreme necessity. End quote from al-Sharh al-Mumti’ (5/369). 
And Allaah knows best.