What should the person do who cannot perform Wudu' because of old age?

Q: My father is around seventy or eighty years old and he is suffering from several illnesses, such as:asthma, diabetes, and inflammation of the spinal nerves and joints, and he has been bedridden, unable to get out of his bed, for three years now. My question now is:1.If he tries to perform Sawm (fasting), he has to break it after half a day as he cannot continue. What should he do during the Sawm of Ramadan?2. He can not perform Wudu' (ablution) in the required manner, as he can not sit or stand to do it. What should he do if he wants to perform Salah (Prayer)?3.His clothes are never free from Najasah (ritual impurity), such as drops of urine or traces of feces, because he is sometimes doubly incontinent. I hope you that you will reply to my questions.

(Part No. 5; Page No. 353) A: All Praise is due to Allah Alone and peace and blessings be upon our Prophet Muhammad, his family, and Companions. Firstly: If your father is unable to perform the Sawm due to his old age or an incurable disease, it is permissible for him to break his Sawm. He should feed a needy person half a Sa` (1 Sa`=3 kg. Approx.) of wheat, dried dates, rice, or any type of food that is common in your country, for every day that he does not fast during Ramadan. Secondly: If your father is unable to perform Wudu' by himself or with the help of another person, he can perform Tayammum (dry ablution) with pure earth. Thirdly: If your father is unable to control his urination or change his ritually impure clothing, he should perform Salah as he is able to, removing the Najasah and performing Tayammum for each Salah. If he can wash the Najasah from his clothes by himself or with the help of another person or change his clothing for those that are Tahir (ritually pure) at the time of Salah, this will be required, as Allah (Glorified and Exalted be He) says: So keep your duty to Allâh and fear Him as much as you can May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.