Is the bequest of one who bequeathed to be buried in his grandmother's grave carried out?

Question:
From the questions of this questioner from Jordan, she says: A man bequeathed that after his death he be buried in the same grave in which his grandmother passed away; because she was beloved to him during her lifetime, and he loves her on the grounds that the time that has passed since her death is a long period, and the body no longer exists in the soil. So, is such a bequest carried out?

Answer:
The Sunnah is that a separate grave be dug for him, and it is not carried out. The grave remains for its owner, except in case of dire necessity. If there is a dire necessity, such as a shortage of land, and the town is narrow and they have no space, then the deceased is buried with him. But as long as there is no shortage, the Sunnah is that the graves remain as they are, and he is buried in a separate grave. Even if he loved her very much, he is buried in a separate grave. This was the Sunnah, and this is how the Companions (may Allah be pleased with them) were in the time of the Prophet (peace and blessings be upon him); each one was buried in a separate grave.
The two and three were only gathered in the Battle of Uhud because they were struck, and it was difficult for them to bury each one separately, so they would gather two or three in one grave in the Battle of Uhud. But in times of abundance, no, each one is in one grave. Praise be to Allah. Yes.

The presenter: Praise be to Allah. May Allah reward you with good, Your Eminence, the Shaykh.