Property adjacent to mine caught fire, residual damage happened to my house

[Gabe Mcmullen]

My house was attached to another house, which caught fire due to the owner's negligence (most likely, unconfirmed at the moment). I'm going through the motions with insurance, and a restoration company already. I think I have everything under control with all of that stuff. 

 My tenants have been displaced, and my heart breaks for them. Their apartment (two blocks away) caught fire on New Years Day, and they moved into my property three weeks ago. They have once again been displaced. I am wondering what my responsibilities are, and what I need to do for them with rent. Their rent is $2,050 per month. They were given a gift from a local non-profit for $950 that was applied to February's rent, and they paid the remaining $1,100 balance on Feb. 1st. My thought process is that I fully refund the $1,100 and then credit $510 of the non-profit gift money towards the next available month that they are able to live in the apartment. I don't think it's right to keep the money if I don't need it. What would you do?