Renting a property to people whose dealings are doubtful

Q: My father in law owns a building, all the portions being given on rent. Though the land belongs to my husband but he is not given any amount nor has he ever demanded as he is having a good job and my father in law's only source of income is the rent from the building.

The rented places are.... A bank, an MRI CT scan service, a gym, a gents salon, a female beauty parlor, a tobacco shop, and an estate agency.

1. I want to know if the income in the form of renting to these places is permissible?

2. When we stay at our in laws, can we eat the food bought with the same money?

3. If one qurbaani share in a cow is purchased with the abovementioned income, will it have an effect on the other shares of qurbaani?

Meanings of the names Uswah and Marwah

Q: I want to ask about the meanings of two female names my sister wishes to give her new born baby... One is Uswah (meaning on internet available is sunnah or practice) and the other one is Marwah (meaning on internet available is a mountain in Makkah or a white bright stone)

Kindly confirm the meaning of these two and suggest if these names can be given to a baby girl? We need your suggestion as naming a baby is a very important matter.