<human>: Can you give me the gist of the text in a nutshell?

So the story goes that I took over a sublease. The cats belong to the previous tenant, they were an acquaintance, I am a soft hearted animal lover, so I said I would foster them until the owner found a living situation on the other side of the country. 

They are good girls and I have fostered them for a year. That's 9 months longer than was agreed. I'm not fed up with them, quite the opposite. Now I am upset I will lose them one day. One girl is 11- 12 years old. I understand that the owner had her for a long time so I can understand the bond they share and I would be less to see her go. It's actually getting me worried as the cat has had health issues and is getting older and i want jer to be with her family before it's too late... but I have known cats to live past 20. 

Recently I found out that the second cat who is 5 was was only adopted a few short months before the owner left her with me. I have this cat longer than the "owner". Cat two also has anxiety due to being rescued from a hoarding situation, and I don't know how to approach the owner to say "sort these cats out" because they have only ever offered the solution of re-homing them temporarily  (splitting them as well). Cat one would go to the owners parents and live with another cat that she lived with. Cat two would go to a sister, situation unclear. None of this was discussed with me and owner has not said thank you and only speaks to me when they remember to send food money. I was given no information on their recent medical care and only found out about it when a friend who works at their vet checked for me. I have no idea where to even start with the owner... I worry they will be dramatic and just remove the cats.
<bot>: fostering cats, owner has basically abandoned them with me for a year. Don't know what to do, am afraid of confrontation about it.