Responsibility of taking care of old parents

Q: There seems to be a growing trend amongst our Muslims to pass on the responsibility of taking care of elderly parents to the daughters. Sons are evading the responsibilities although they inherit 2 shares and daughter in laws are afraid to accept that's it's the husband's responsibility and use hundreds of justifications on why the daughter should look after the elderly parents. Although knowledgeable about Allah's wisdom in choosing the sons, but are in total denial. In some instances, daughters are battling financially but are bullied into taking over the responsibility of the sons. Please advise and also have this as an ongoing discussion because people are conveniently stuck in their thinking about this issues because it doesn't serve their needs or are in huge denial although clearly spelt out in Allah's commands.

Females placing their elbows on the ground when making sajdah

Q: According to the Hanafi mazhab, females are supposed to be close to the ground during sajdah and should therefore put their elbows on the ground. But there is a Hadith in which Nabi (sallallahu alaihi wasallam) says that doing so is imitating dogs. Maybe that hadith was meant only for men, but just to be on the safe side, am I allowed to raise my elbows off the ground?

Finding a stain and odor on clothing after washing

Q: My non-baaligh brother often has accidents. This time, when he pooped in bed, I threw the bedsheets in the washing machine along with his underwear which was first washed by hand, and set the rinse 2 times for a total of 4 hours. During the second rinse I even threw in some of my clothes. As I was taking everything out of the dryer, the stains from the sheets were completely gone, and all the clothes smelled good, but then his underwear had a very light brownish colour and some odor. Does that mean the underwear is impure and everything else that was washed with the underwear is also impure? I put everything in the dryer before I noticed any of this so does that mean the dryer has to be purified now? What must I do?