Are the homes of the suitor's family and his brothers, their shops, their cars, and the places where the suitor sits, judged to be pure or impure, knowing that the suitor's elderly and sick mother urinated on a bed on which everyone sits, and they go with those clothes to their homes and shops?

The obsessive whispers (waswas) have greatly affected you. You are obligated to disregard and ignore these whispers and not pay any attention to them. There is no certainty that the yellow spots are from urine, and the default assumption for things is purity (tahara). Even if we assume they are urine spots, some scholars hold that impurity does not transfer to something that touches a wet or damp spot. There is no harm for you in acting upon this opinion, especially since the waswas has reached this extent with you. There is no need for washing or cleaning; rather, you are permitted to rule all these things as pure. There is no need to abandon your fiancée. The solution is to ignore the obsessive whispers and turn away from them.