Salaah of a sick person

Q: A person normally prays on a chair (can't sit on the ground because of his back). Is it permissable for him to pray his salaah in his car (facing the qibla)?

Q: If someone performs Salaah sitting on a chair due to his knee problem, is it ok to keep his hands out of his knees facing qibla or he should keep his hands on his thighs before his knees?

Q: If a person can offer Salaah on a namaz bed by facing his legs towards the qiblah, then should he offer Salaah like this or by sitting on a chair?

Q: If a sick person is able to stand in Salaah but unable to perform ruku and sajdah, can he stand in front of the chair and sit down at ruku? Is this permissible or should he sit on the chair from the beginning? Which is preferable?

Q: How should a person perform salaah if he has a back problem? Can he sit on a chair and perform salaah? I was told that if he does not have a serious back problem and he performs salaah on a chair, his salaah will not be valid. Is this correct?

Q: I am 50 years old. I have been making namaaz regularly in the musjid daily all my life and for the past year or so. I make namaaz at home and only jumah in the musjid. This is due to chronic pain in my feet, toes and legs and I can't bend my toes anymore hence I sit on a chair when I make namaaz. I only go for jumah and don't sit on a chair at jumah. I make the two rakaat fard of jumah normal though I go through great pain. As soon as the fard is over I leave the musjid instantly. My great worry is that recently I read that we can't sit and make namaaz. The article read beware of the chair and stay away from the chair as namaaz on a chair is not accepted. I am in deep worry and cry a lot daily. I am unable to go for treatment to a private doctor or hospital as I am a pauper. I cannot go to government hospitals as every person I know with feet problems like mines land up with operations in the government hospitals but either loose their legs or land up with their feet being worse. I don't drink nor smoke. I strictly eat halaal food and live a clean life but still have this problem. I want to know if all my namaaz I made sitting is baatil. Yesterday I put pads around my feet and legs and attempted namaaz standing but the pain extends to my back. I am not cripple nor old aged and have no sickness so old age is not an excuse. Kindly advise what to do as I am unable to go for treatment so this pain becomes worse hence I will be sitting and makng namaaz.

Q: I am a diabetic. I feel pain in my legs and knee joints very often. Although I am not very old and I can walk easily, but I find it difficult to move up and down during salaah. My question is that if I offer salaah in the sitting position whenever I feel pain, would it be valid?

Q: My granny is about 67-68 years of age and due to back pain and knee pain she is unable to pray her Salaah in the standing position and it is difficult for her to do ruku and sajdah while standing and praying. Is it ok if she performs her Salaah sitting?

Q: I have an aged grandmother who has been diagnosed with alzheimer's disease. Unfortunately, her condition has deteriorated to such an extent that she forgets many things. Her salaah is one of the things that she is constantly confused about. She performs Salaah at incorrect times, says she read it when she hadn't read it and mixes up the salaahs. She also forgets to perform wudhu, sometimes performs it incorrectly, and at time makes tayamum. We try to correct her and guide her, but sometimes it is impossible. What is the correct ruling in this regard?

Q: I am punctual on my Salaah but since my dysentery (i.e. inflammation of the intestine causing diarrhea with traces of blood) I have not been offering my prayers. It's been six days now. Today I felt better so I made ghusl and performed asar and magrib but now the pus and blood are passing in my stool. Am I again napaak? Please advise?