Ruling regarding a woman who emits a discharge throughout the month

Q: What is the ruling regarding a woman who emits a discharge throughout the month? 

For ±3 days before and after her haidh it is brown in colour. Her bleeding lasts for ±8 days . During the rest of the month her discharge is yellow or white. 

If she regards all coloured discharges as haidh then those days when she is actually bleeding may fall under istihadha?

Hurmat-e-musaaharah not being established by touching one's grandmother or uncle's wife

Q: 

1. If a man touches his maternal grandmother with lust, does the marriage of his mother with his father break? 

2. If a man touches his paternal uncle’s wife (Chacha’s wife) with lust, does his paternal uncle’s marriage break? 

I am dealing with a lot of thoughts about hurmat musahara.

Wife taking her husband's surname

Q: I have heard that you are not allowed to take your husbands surname after getting married according to these verses: 

"Call them by their fathers names; that is more just in the sight of Allah. (Quraan 33:5)" 

The Prophet (sallallahu alaihi wasallam) said: "Whoever claims to belong to someone other than his father has committed an act of disbelief. (Sahih Bukhari 3508, Muslim 61)". 

a. Are these quotes correct? 

b. Is the statement you're not allowed to take your husbands surname after marriage correct? 

c. I know of people who have registered themselves for marriage at Islamic centres and they have asked women if they want to take their husbands surname. 

Virtues of reciting Surah Hashr

Q: Surah Hashr - The Messenger of Allah (sallallahu alaihi wasallam) said: Whoever recites Surah Hashr then none from among Paradise, Hell, Arsh (Allah’s Throne) Chair, Curtains, the seven Skies, the Seven earths, space, wind, birds, trees, mountains, Sun, Moon, and angels would miss seeking forgiveness for him and yearning for his safety. If that man dies that day or that night he would die a martyr. 

Is this authentic? Does one have to recite this Surah everyday to get this virtue?