If your tenants want to have a room mate to save on rent they should be able to do that as long as they still meet your minimum requirements.

@Sherief Elbassuoni oh thank you I’m mostly just looking into house hacking a multi family but I’m also living with roommates right now so I’m not opposed to that just in a property I own myself

One of my roommates is from Africa. 

I also recommend making a list of Landlord problems (marketing, screening, unpaid rent, tenant wants to break lease early, tenant wants to add/remove roommate, unauthorized pets, etc.), develop a plan for tackling each one in accordance with the law, and then develop a written process so you're prepared.I also recommend you learn the power of leverage. 

We have helped three tenants move our of one of our properties and into a new home this year: One was a relationship breakdown; the second was a student whose roommates were leaving and had to downsize; and the current one needs a bigger apartment as his Mother had finally gotten out of Syra.

In three months, rent has been late twice, he's refusing to pay the July late fee, police have been there three times for disturbing the peace and I'm fairly certain he's got a roommate living with him (he denies it) that isn't on the lease. 

@JD Martin Do you allow your tenants to have roommates ?

It can be helpful to screen out large groups of roommates.

I've also done house hacks where I pay for everything, and with roommates and my 9-5, fix the house over the course of 2 years or so.

I've lived with roommates (both friends and strangers) the last 5 years, and really have no issue with the idea, but both our parents think we're nuts.