She doesn't currently make enough on her own to cover the rent comfortably, but her brother is willing to co-sign to make sure the rent is covered.We are thinking that we restructure the lease so that there are the two tenants, each co-signed by their respective siblings, so that we have 4 people that will be responsible for making sure the rent is covered each month.Would really appreciate some advice about what to do and would like to hear why our plan isn't a good idea (and why). 

I bought this house for my mother and siblings while I am in New York.

Get everything in writing, signed and notarized so that her siblings and your siblings can see that this what she actually intended.You could set it up as a purchase & sale for whatever amount you felt you wanted to.

In Quebec you can't evict tenants easily, the only way to do so that I know is if you retake the unit to live in it or for your parents/siblings.

Ideally, the cash I put up for the lien would be carved out of the share of the sibling who was living in the house. 

I have had a storm hit while in a similiar situation who pays for the uncovered damages was a issue seen differently by some siblings

But of course would like to know if her and siblings are now owners of this property.Let’s say the daughter is the inherited owner, Where would the daughter go to obtain the key!?

I have a property in the Stone Mountain area that I manage/own along with four siblings.

So if someone fraudulently books the place for their younger sibling, friend, etc they are liable for any deposits and damage.

This person needs to be EVICTED,But here’s the fun part,This person is not legally a tenant, but just a sibling of my friend.....