UK

So my oh s nan has recently gone into a home , his mum and older sister have taken charge of sorting everything out (house,belonging, care home ect ) as they told everyone they were next of kin and power of eterny .

They went to clear the house out with another family member and found "20 k " in cash that the nan had been squirreling away . The sister and mum said they would take the money due to the reasons above and put it into the bank .they didn't tell any of the other family members about it . A couple of days later the family member found the money in a tin hiding in the mother's house and told my oh . The mother and sister have been spending a lot recently (new garden , toys , gifts , giving people money ) which doesn't make sense as they are not well off especially with covid .

So we think they have taken the money and started to spend it for themselves ,to top it off the sister told my oh that's she's not got power of eterny social services do and they can't make any decisions it has to go through them . Family members the nans other children and grandchildren have been stopped going into the house and haven't been allowed anything by in ohs mother who told people her daughter was power of eterny (daughter didn't know that she had told people that )as is making the decision .

What can my oh do as he feels his nan is being taken advantage of ? (Legally and practically with the other family members who still don't know this ) as it appears his mum is trying to get control of all the belongings and money for herself and stop other family (this including child hood memoirs ect ) from having anything .