Claiming from insurance more than the damaged amount

Q: Scenario:

I met up in an accident some time ago. The back bumper and other parts were damaged. I then met up in a second accident and, the car was damaged at the same place before I got it fixed. The person with the second accident has insurance.

So will it be permissible for me to claim the complete cost of it and not tell them that the car was in an accident before. If I do tell them that the car was in an accident before, the insurance company will not pay anything for the damaged.

Will it be permissible for me not to tell them and claim the entire amount from them?

Washing mosquito blood stains from one's bedding

Q:

1. I have a problem of mosquito blood staining my bedding. I therefore wash that part only but do not do so 3x, sometimes only once because the blood is removed. Is this ok?

2. The water that falls elsewhere on my bedding from the washing of the blood, is it considered napaak? Do I have to wash that area where the water fell as well? - since the water has been used to wash blood.

3. Is the area where the above mentioned water fell has dried with no traces of impurity, will it be considered pure?

Judging people according to their ibaadaat

Q: My cousin is a Hafiz Alhamdulillah. He is pious but he wont do any Tabligh work. He wont tell people to pray or to leave out sins. He leads Taraweeh every year and he is busy in his life. My other cousin is a doctor. He is also pious Alhamdulillah he does Tabligh work with his doctor profession.

My question is, on the Day of Qiyamah, whose status will be higher; this doctor who is doing Tabligh or this Hafiz?

Collecting social grants paid by the government

Q: Is it permissible for Muslims to collect social grants paid by the government as alot of the taxes collected by the government is derived from the sale of haraam products and services such as alcohol and casinos. Just as cooking a large meal in a big pot with all halaal ingredients and then mixing the meal with a little bit of pork makes it haraam, does this principle apply to the collection of grants by this government?

Estimating the amount of qadhaa salaahs

Q: I have many qadhaas over the past 3 or 4 years. I've tried guessing but I have absolutely no idea, records, nothing. I usually pray all 5 prayers on time now, so would it be okay for me to start praying my qadhaas without making an estimate?

As I've mentioned, I don't have the slightest clue with which to make an educated guess. The longer I keep trying to estimate, the longer it gets put off. It's been two years already.