Using any type of sinful music is not permissible and money earned from that sinful act is also not allowed. Sinful music is the music which is usually used by sinners.

Wassalam.

Aqeeqa is recommended for every Muslim child on the seventh day after birth, and it can e be done any time after that by slaughtering a sheep or goat or cow or camel and distributing its meat to people.

Chilla has different meanings in different countries and cultures. Please clarify your question and which type of Chilla you are asking about, so that I can try to respond to it.

Wassalam.

Muslim wife must treat all the children of her husband including from other wives with justice and kindness with out any discrimination. Motherly rights are on her own children but children from other wives must keep the respect of the wives of their father. 
'Wassalam.

Direct communication with potential spouse must remain within the frame of Shariah as both of you are still Non Mahram to each other. Flirting or flirtation with a potential spouse remains Haraam till both of you enter in an Islamic contract Aqd which allows that. Chatting should never contain any emotional content before having a valid Aqd between you. If both if you want to meet, it should be in the presence of another person to avoid the Khalwah (private meeting) which is not permissible with out a valid Aqd.

Wassalam.

This narration is in Saheeh Muslim which is the second most authentic books of Hadeeth among our Sunni brothers, in which Umar ibn al-Khattab  himself told Abdullah ibn Abbas that : You and Ali looked at Abu Bakr as a liar, traitor, licentious, then looked at me as a liar, traitor, licentious.

This statement of Umar reflects the stand and opinion of Ali (AS) about Abu Bakr and Umar.

Wassalam.

The reward if praying in any Masjid is greater than the reward of praying at home. The reward of congregational prayer is much greater than praying alone.

Wassalam.

Wearing acrylic nails in your nails prevents water of Wudhu or Ghusl from reaching to your real nails, hence invalidates your Wudhu and Ghusl. If you wear it after performing Wudhu or Ghusl then pray Salah, your Salah will be valid because your Wudhu or Ghusl were valid as you performed Wudhu or Ghusl with out wearing anything stops water from reaching to your nails.

Wassalam.

Your adopted sister is not your real sister, so, you are not allowed to look at her unclothed. Hijab rules apply on you and her .

Emergency has got its own exceptions just like emergency rules to save life of any other female who is non Mahram to you.

Wassalam.

Welayat al-Faqeeh is an Islamic rule regarding the authorities of the Jurist being highly learned or the most learned in Islamic jurisprudence. These authorities are been discussed by great Shia scholars and all of them agree on the principle of the authorities if the jurist (Faqeeh) but there are different opinions on the extends if these authorities. 
'Wassalam.