I also work abroad and did not see my Mom for a couple of years.
My 1 brother and I are not really on speaking terms, however when the opportunity arises I took my other brother with me and we went to visit my Mom. It was the best day I spent with her and my brother. 4 weeks later she departed...
Ok, no matter what, a thief will get your stuff IF he 1. wants it and 2. if he have enough time.
So, here goes. A little preparation is needed but in the long run, I think worth it
Get 32mm rebar and make a loop like the below sketch
Cast that into the floor that only 50 - 60 mm is...
Sorry to hear of your loss
If you want a chain that is hard to cut, get yourself a chain from a block&tackle. The chain that do the hoisting not the 1 you use to pull onto.