Aviza, there are so many warning bells ringing here. His actions are very suspicious.

Whilst it's great for an elderly parent to have a life of their own (possibly seeking another partner), men can be gold diggers as well as women. I can relate to some of what you are saying. In her late 70s, my mother got involved with neighbour. Despite him having more money than her, he was mean. They were supposed to be an "item" although he was always on the look-out for someone else. In one case, he told her what he was doing.

I was very careful in expressing my wariness of him. Sadly, he developed alcohol related dementia. Instead of distancing herself, my mother took on carer duties despite him having two children. When I talked to her about the situation, she was defensive.

Everyone reacts differently to these situations. You are right to question his intentions. A police check seems the most sensible route. Please persuade your mother to do this quickly before she actually hands over any money or cannot extricate herself from a difficult situation.