Is it obligatory for the questioner to leave the accommodation she shares with her sister and her husband, due to her suspicion about the purity of everything and her clothes, because her sister's children do not take precautions against impurities when using the bathroom, and because her sister's husband urinates standing up, which causes drops of urine to be found on the toilet seat and the automatic washing machine, and because the children sometimes enter the bathroom barefoot after their father exits?

We advise the questioner to disregard whisperings (waswas) and not pay attention to them. If he is certain that a specific spot on the bathroom floor has been contaminated by impurity, he should pour water over it until the impurity is submerged and consumed by the water. This is sufficient for its purification. He is not obligated to purify what he is not certain has been contaminated by impurity, and there is no justification for doubting the purity of his clothes. If his sister's children walk barefoot in the bathroom, their feet are not considered impure unless he is certain they stepped on a wet source of impurity itself. It is appropriate to teach his sister's children how to purify themselves and how to guard against impurities. He should also advise his sister's husband that urinating while sitting is better and closer to safety from being afflicted by impurity and contaminating the place.