We are lucky here. Low crime rate. Catalytic converters are the 'in' thing to be stolen recently. I never had a key to my parents' house. It took over 30 years for Mum to even consider giving me the spare
........ yet she had given one to people she had 'known' only a few months ......... of course, she didn't think to tell us until they let themselves in whilst she was out one evening and frightened her ....... then she 'turned' on them
.......... that was the evening we found out that she was letting people have keys and they were making copies and giving them to all and sundry ........... DH had words with her as we are her main 'carers' when push comes to shove
then he changed the locks after great explanations ..........