Reading books that create doubts and suspicion

Q: Recently I read a book and it contained things about another religion. I suffer from severe waswas so I started thinking what if I disbelieved in what should be believed. So can you please tell me whether these statements are correct in the light of Islam or not.

1- God will not abandon us

2- Hand of God is leading us

3- Lord stretched out His Hand and gathered you in the true fold as He will all nations in His own good time

4- The Hand of the Lord shall be heavy upon you

5- and the Lord go with you

6- He shall arise and smite you

Is the abaya a compulsory dress?

Q: I have an elder sister and she is at the age of marriage. She got a proposal and the boy is good in all conditions but he wants his wife to wear abaya while my sister does not want to wear abaya. The boy's family said that abaya is necessary or else they will cancel the proposal. What should we do? Should we force our sister to wear abaya?

Husband asking the wife to return from her parents house after delivery of the child

Q: My daughter Gave Birth First child how long is she allowed to stay with her parents? Both mum & child need mums attention Husband being inconsiderate wants her home as theirs no one to baby sit him. He’s complaining and nagging my daughter that driving from work to our home is tiring and no one to see to him. As a father I have been very patient.