disabled person

Using a robotic woman's voice in apps for disabled people

Q: I want to make an app for disabled people. I want to make an app that uses text-to-speech and speech-to-text function. Text-to-speech has a robotic womens voice, so is it permissible for males to hear such a voice? Is it permissible for me to launch such app and sell.

Secondly, I want to make speech-to-text app for the deafs so that deaf can receive incoming calls, subtitles will appear, so is it permissible for me launch such an app? If any woman is calling, so her voice will be translated into text form. I think this background process will also be robotic. Is it permissible for me to launch such app?

Inheritance

Q: 

1.) Mother (82 years) passed away 4 months ago (no Father), her estate to be divided Islamically between 5 sons (3 physically and mentally challenged) and 2 daughters, 3 weeks ago 1 son passed away (disabled, no wife or children, age 62).

1. How must his share be divided or shared?

2. The mother requested verbally that if any of the diasabled pass away then that share must go to the other 2 disabled sons. Is this permissable? If yes how is the estate treated if all 3 disabled sons are deceased.