Saying Aameen in one's heart in Salaah

Q: As far as I am aware, speaking intentionally or unintentionally will nullify the salaah and it will have to be re-prayed again according to the hanafi maddhab (although, if I am incorrect in my understanding then please correct me jazak Allah khayr). The question I would like to ask is that say for example, if I recite اَللَّهُمَّ رَ‌بَّنَا آتِنَا فِي الدُّنْيَا حَسَنَةً وَفِي الْآخِرَ‌ةِ حَسَنَةً وَقِنَا عَذَابَ النَّارِ‌ and in my heart I say Aameen but my tongue may move slightly unintentionally, however there is no sound of any letters coming out, can that be classed as speaking in Salaah?

Wearing a taweez

Q: What is the ruling regarding a baby or any person for that matter wearing a Taawiz for protection as well as wearing black beads? Can we not put our faith in Allah by simply reciting the various surahs and duas for protection?

Waxing the private areas

Q: What does Shariah says about women waxing the private parts every month? Is it necessary to wax every month because here it is said that if you won't wax regularly, you won't be clean even after a ghussul and the salah will be invalid.

Consulting one's elders with regards to nikaah

Q: I am in love with a girl who is my aunts daughters. I want to legalise this relationship by performing nikaah with her but my parents are against it due to internal disputes with my aunt. Will it be right if I go against them as I see no chances of they getting convinced and if I want to convince them suggest me ways of convincing them. I feel very depressed and confused.

Washing the toilet seat

Q: If someone is in a state of Janabah and when using the toilet, semen falls on the toilet seat, will using the jug to splash water on the toilet seat wash away the semen or should a wet toilet paper be used also to wipe the seat to make sure it's clean?

Correct pronunciation

Q: When we say the Kalimah Laa Ilaha ILLAllah Muhammadur Rasulullah, then can we also say La Ilaha ILLAllah Muhammadun Rasulullah? With the nūn? Because in my local masjid there used to be a muezzin who used to say Ashadu Anna Muhammadun Rasulullah or Muhammadan Rasulullah, and the Imam said he was wrong and it should be said as Muhammadur Rasulullah.

Kissing one's daughter

Q: One day I was caressing my daughter (about 4 years old). Suddenly I felt little lust. Quickly I stopped caressing her and took her off. After this incident I repented and made tawbah to Allah Ta'ala. Does this incident affect my marriage?