Doubting whether haidh has ended

Q: Toward the end of a menstrual period, often it is not clear if the period has ended or not. This causes a frustrating problem: should she wait until she is sure the period has ended, even though she is risking missing a prayer, or should she make ghusl and pray even though it is possible the period has not yet ended? You see, if she chooses to be cautious, often she has to make multiple ghusls until she is finally sure.

Paying for one's divorced wife's expenses during her iddah period

Q: If 2 people are divorced. The girl moves to another town. The ex husband tells his ex brother in law to ask a mufti in his area twice to ask how much iddah money I have to give. But he doesnt ask and says its ok about the money. But I said, no I have to give as its my right. Then he says ok. Do I still have to give? As my ex brother in law is a moulana and he knows its the right of the ex husband to give iddah money. He still didnt ask a mufti. But I gave for 1 month.

Touching a cloth with dry napaak hands

Q: I have read that in order for najasat to transfer from one place to another, flowing wetness needs to be transferred. Now if my hands are not paak but dry, and I hold a cloth in my hand, does it become napaak?? The point where I am confused is that a hand is always sweating and in bright light very tiny droplets of sweat are always visible. Now if in such a scenario, if I touch a cloth, given my hands are not paak but apparently dry and I cannot see any wetness transferred to the cloth, does the cloth remain paak? Does this situation correlate with the ruling that a najsat with size less than a dirham coin could be ignored?

Inheritance

Q: My question is about inheritance according to Islamic Shari'a law. I have a stepmother who has no kids, I have one brother and one sister. What would be the inheritance share from a deceased man in case of two sons, one daughter and wife (our step mother) who has no kids. Our mother died long time ago.

Washing dried semen

Q: I had released semen at night which had dried on my private area when I woke up in morning. When I did ghusl, the dried semen was not coming out, even after scratching or rubbing the skin. I left it and completed my ghusl, and offered fajr. This dried semen did not come out until I scratched it again after a week, and even then I think it did not come out completely.

1. Does this dried semen keep me impure?

2. Will I have to repeat the prayers I offered with this?