Breakers of wudhu

Q: What are the common causes for the breaking of wudhu. Please confirm. If I am not sure weather I farted or not can I say my prayer? If I see any video of naked people on whatapp (so many people send picture / videos), would my wudhu break? If I talk abusive language, would my wudhu break?

Problems with step-mother

Q: My parents were separated when I was two  and divorced when I was 10. Now I live with my father and his 2nd wife. Relationship between her and me is not stable since her entry in the house. She always says something objectionable about me to father and father doesn't investigates. She ruined my character in front of him and my neighbours. Every time hates me. Does anything to distract me from studies, and I am preparing for medical. But she always disturbs me. What shall I do? I complain to father. She puts the blame on me. Anyhow..! What is the solution..? I am not able to tolerate these things anymore.

Nifaas

Q: I really need help! I gave birth 2 weeks a go, Alhamdulilah! Do I have to wait for 40 days before starting my prayers? I'm not bleeding like it's suppose to be after child birth? Should I wait,or just pray ,then when I start bleeding again stop my salat or what? Help me out please.

Father postponing the marriage

Q: My question is if a brother has asked my father to marry me and my father likes him but wants us to get engaged for a period of time before marriage, what should I do. My father is my only wali and I would prefer to marry this man in order to make things halaal instead of possibly falling into haram. However I feel that my father is acting in a cultural way rather than Islamic. Could you please help me Insha Allah.