Taking out medical insurance to do a liver transplant

Q: I currently live in Bangladesh. My father suffers from liver cirrhosis. I have plans to do Masters or PhD in USA. It is recommended for my father to do liver transplant but currently the liver transplant is not available in Bangladesh and in India it will cost 1-1.5 crore Bangladeshi Taka(currency), which is out of my reach.

When I start PhD in US, will it me permissible for me to buy an insurance for my father, take him to US and do the liver transplant and then send him back to Bangladesh? I cannot find any Takaful Health Insurance in US and don't know how the rest of the insurance work there.

Will it be permissible in a case like this? 

Men staying at home during ladies taleem

Q: Ladies taleem is arranged at different houses each week for 45 minutes. When taleem is at a specific house, can the men of the house still be there, in another room, as long as they don't interact with the ladies doing taleem? So as long as the men stay in another room, and dont walk pass the ladies, or directly overhear them, will it be ok? Or must the men leave the house entirely before the ladies arrive?

Working in a business that sells traditional muti products

Q: At work, I'm one of the buyer's for the cash 'n carry. They sell these traditional muti products amongst many other cosmetics, sweets, household items. These traditional muti products like tokoloshe salts, oils, etc. have phrases such as "win the lotto", "bring back lost love", "go away evil", etc. on its packaging. Now I have to buy these products, price it, promote it and so on, amongst other items. I really feel uneasy about it as its wrong and impermissible to sell according to my weak understanding. I don't know how to approach the boss and inform him. And the more heartbreaking thing is that one of the biggest suppliers of these products is Muslim owned, and also many of our Muslim brothers have specialized shops selling these products. What should I do and is my earnings doubtful or haraam?