1. Delaying isha salah is ok if it’s within time frame of its recommendation, as the Prophet used to combine and separate prayers in different occasions
2. Yes you can break fast with your Sunni family by taqiyya (some Shi’a marajie allow it)
3. Ayatullah Hakim allows temporary marriage without sexual intercourse without need to take permission of father. You can follow him in this ruling. Please be advised on the strict condition as above