The tenant should have sent a certified notice of the damage (water entering the unit) as well as notifying the landlord that water was soaking into the floor, wall, carpet, etc. before there was mold. 

However know it could get messy and if you do it then you are willing to ruin your relationship with your parents.

,Most of your contractors will charge you plenty because it is a very messy job.P.

It's nicer inside that others comparable in rent here, nicer carpet/windows/paint vs. the standard plain white walled rentals and cheap carpet.

If it just needs cleaned, schedule your cleaner and carpet cleaner the day after they move out and you should be good, unless you know there are repairs that have to happen first.  

Generally if it is something like carpet and you replace it with similar carpet, you claim it when it is done (ie current expense). 

As for communication with the girlfriend, I would suggest that you do not maybe as it could be seen as harassment if the tenant has even taken a screenshot of him telling you not to do so- you were asked/told, and beyond that it could get messy, even with her name on the lease.So yes, my best advice also would be to indeed seek professional legal advice and avoid all further communication until you do so!

It looks great but much more costly comparted to carpet so I question if its worth it.I do see carpet tiles in many offices I visit so I am just unsure.Thoughts? 

It's difficult to sell tenant occupied properties as the tenants could make the unit as smelly and messy as to discourage the highest and best bidder.

It had new carpet installed throughout when I purchased it, and is in great shape otherwise.