Hi Grace I am a Social worker in the HSE in the Dun Laoghaire Area in Primary Care with the adult population. There should be a Elder abuse worker in every HSE area in the country or a HSE rep that you can talk to. Financial abuse is punishable by the law. There are 2 options Ward of court which can cost up to 18000 in solicitors fees and this is taken out of your mothers estate or the enduring power of attorney which your mum decides in front of a solicitor to hand over her financial / care affairs to members of the family to protect her in case she suffers from dementia in the future. You would want to get your GP to get a geriatric assessment of your mum if you think she is beginning to lose her memory etc and contact the local Pubic Health Nurse in the are where you live to get supports for you and your family if this chap is abusing your mum either you need to take action to protect her.
You can send me a PM and I can go through the options with you or put you in touch with your local elder abuse case worker.
Well-done on stepping in, Mr T. Excellent post and good to know that structures are in place in this country to deal with the problem of elder abuse.