Is it obligatory to carry out the mother's will to bury her in her cousin's graves, knowing that the questioner will not be able to visit her grave there, and is it permissible to bury her in the father's or grandfather's graves so that the questioner can visit her?

If a Muslim bequeaths to be buried in a specific cemetery, his heirs should carry out his will if it is easy to do so without hardship or difficulty, and there is no religious impediment. Visiting the deceased is one of the recommended acts of worship, and therefore burying the deceased in a place where it is easy for his family to visit him is preferable. If the mother bequeaths to be buried in a specific place, the children should seek her permission to bury her in the grave of the father and grandfather to facilitate visitation. If she does not grant permission, they should ask for the key to the tomb. If there is any objection to this, then it is more appropriate to bury her with the father and grandfather, and burying a woman with a mahram (unmarriageable kin) is better than burying her with a stranger. A barrier of earth should be placed between them. It should be known that honoring one's parents after their death is not merely about visiting their graves, but rather by praying for them and seeking forgiveness for them in all circumstances, giving continuous charity (sadaqah jariyah), providing beneficial knowledge, and raising righteous children who will pray for them.