Difficulty in performing Salaah after a rectal operation

Q: A 87 year old male is permanently taking over 7 different medications, including insulin injections twice daily. After he had rectal operation to remove cancer, he cannot control his bowel and bladder very well. Before this he prayed 5 times daily. The situation is this:

He has to visit the toilet frequently for bladder and bowel. His clothes always have some napaaki on them. He is not fit and healthy enough to perform istinja/ wuzu without making more napaaki. He is only able to have full bath/change clothes every 1 or 2 weeks. He can do istinja/ wuzu and change clothes for Eid prayer, but not daily. Besides this, he is alright and looks fit and healthy for his age, he has no other mobility problems, and we thank only Allah for this.

Mufti Sahib, so if (1) istinja/ wuzu is a problem and (2) changing clothes frequently is also a problem, both problem are affecting this person. What is the ruling regarding salah, i.e. Taharat, tiyamum etc?

He has not read namaz for past 12 months due to these issues, but he desperately wants to read namaz.

Social security parent's fund

Q: Please confirm if it is Islamically allowed to be on social security parents as I have heard that it is from money that is from unislamic sources such as riba and gambling etc, and we should not partake in it. I know that some people pretend to be a single mother when their not. They are lying and that is impermissible.They lie to obtain more money for themselves, their husband and their kids. But I am telling the truth me and my husband are on fortnightly payments. My children also receive some money from the government on a fortnightly basis. Is this allowed? Please confirm as I am very concerned about this issue.