Staying overnight in the desert and traveling to al-Madinah to complete her transaction

Question:
He says: Honorable Shaykh, may Allah grant you success. It is a long question. A woman’s husband died, and they were living in the desert. She has no children from this man. Then she went with her son from her first husband to the city to complete the procedures for social security. A woman’s husband died, and they were living in the desert. She has no children from this man. Then she went with her son from her first husband to the city to complete the procedures for social security, and she stayed with him for about two days to finish her transaction. Then she returns to her husband’s house in the desert. It is known that there is no one to take her from the desert to the city regularly. The question is: Is it permissible for her to stay in the city for two days? And is it permissible for her to stay with her son from her first husband?

Answer:
If what is in the desert is intended to be a settlement with built houses, its ruling is the ruling of cities, so she stays in the house. But if it is a tent or a khaimah, these do not have the ruling of houses because they are dismantled and moved and are not stable. If it is a stable house, whether built of stone, clay, cement, or a box made of zinc or whatever is customary, this is a customary house, so she stays in it as long as she is able. But the khaimah and the tent are not stable houses. Yes.