Making dua for the Hidaayat of non-Muslim children

Q: I have adopted Islam and married a Muslim man. I have two daughters from my earlier marriage who was a Hindu man. My daughters have not adopted islam yet. We keep on trying to make them understand and adopt Islam. My elder daughter is fifteen years old and younger one is 13 years old. Elder daughter gets angry whenever we talk about changing religion and wants that we should not talk to her regarding religion in future. Younger one says she will very soon adopt Islam. I want to know how should my husband interact with my elder daughter after knowing that she will never convert to Islam? I also want to know can my husband make dua for them as they are non-muslims but they are his daughters?

Inheritance

Q: My brother passed away prior to my father. Do his childeren inherit from his estate. My three sisters passed away after my father has passed away, do the grandchilderns or the son in-laws inherit from his estate?

The angel Meekaeel

Q: Which work was angel Michael entrusted by Allah? Why did Allah specifically take his name in surah 2 verse 98 along with Gabriel? Who were his enemies which Allah is referring to in the verse?

Making dua while reciting the Qur'an

Q: Whilst reading Qur'an, if a person knows Arabic and comes across an ayat where there's a command to glorify Allah or seek refuge with Him, and the person makes dua accordingly, do they have to recite ta'awwuz again before they resume the tilawat? Would the rulings be different if they made the dua in a language other than Arabic?