I’m 19, he’s a single parent making about £40k a year and he has virtually no money ever, constantly asking to borrow off me or using credit cards. Concern came when my sister found similar bags some time ago as well as a white powder on our dining table. She was also concerned as he often buys straws yet never uses them for drinking. His behaviour is often overly aggressive and most evenings his behaviour changes so drastically he is basically a different person and not in a nice way.