Uneven haircut

Q: As we know, one cannot shave the one part of the head and leave another because that is qaza which isn’t allowed (and since trimming and shaving aren’t the same thing because we know on the occasion of umrah Rasulullah (sallallahu alaihi wasallam) made a special dua for those who shave their hair and for those who trim it meaning there is a clear distinction).

My question is, what if you trim the sides and not shave, therefore it is not qaza? So if I trim it to about 3+ inches which isn’t short enough to copy or fall under qaza, and I cut with a scissor on top, is this permissible?

Do the sons from a previous marriage become mahram to the daughters of the second marriage?

Q: In the Hanafi Madhab, a man has 2 sons and 1 daughter from his previous marriage. He divorces their mother and marries a woman which he then has 2 daughters with.

1. Do the sons from the previous marriage become mahram to the 2 daughters of the 2nd marriage?

2. Do the sons qualify to be mahram to their step mother?

Reading the Yusuf Ali translation of the Quraan

Q: I would like to ask a question regarding the Yusuf Ali translation of the Quraan. I heard in a lecture that Yusuf Ali was unable to speak the Arabic language as well as the fact that they say his version is incorrect.

I also read the same facts online. Can I continue reading this version as I have always done so. Or could you advise me on what is the best translation of the Holy Quraan I could find.