a warm welcome to DTP
this may help
How to make a lasting power of attorney (LPA): starting an application online, choosing an attorney, certifying a copy, changing an LPA.
or if your husband's mum no longer has capacity
How to become and act as a Court of Protection deputy - eligibility, responsibilities, how to apply, fees, supervision and when your deputyship ends.
and this ... taken from Gov document:
Who can be a certificate provider?
A certificate provider must be at least 18 years old and either:
a friend, colleague or someone you’ve known well for at least two years – they must be more than just an acquaintance
your doctor or lawyer or someone with the professional skills to judge whether you understand what you’re doing and are not being forced to make an LPA
‘People to notify’ can be certificate providers.
There are quite a lot of people who can’t be a certificate provider – for example, members of your family or your attorneys’ families. There’s a fuller list below.
The certificate provider must sign after you and can sign on the same day as you (the donor) or as soon as possible afterwards.
Someone who has known you well for at least two years
You should ask a friend or neighbour, someone from your social or sports club, a work colleague, or similar. They must have known you well for at least two years. They must know you well enough to have an honest conversation with you about making your LPA and the things they have to confirm when they sign the LPA.
If possible, they should discuss your LPA with you in private, without attorneys or other people present, before they sign to ‘certify’ their part of the LPA.
Someone with relevant professional skills
Usually, someone with relevant professional skills would be one of the following:
a registered healthcare professional, such as your GP
a solicitor, barrister or advocate
a registered social worker
an independent mental capacity advocate (IMCA)
Other professionals may have skills suited to judging whether you can make an LPA – contact the Office of the Public Guardian if you’re unsure about your choice of certificate provider.
You may have to pay a professional to act as your certificate provider.
People who can’t be a certificate provider
The certificate provider must not be:
an attorney or replacement attorney for the LPA
an attorney or replacement attorney in any other LPA or enduring power of attorney that you’ve already made
a member of your or your attorneys’ families – including wives, husbands, civil partners, in-laws and step-relatives
an unmarried partner, boyfriend or girlfriend of yours or of any of your attorneys – whether or not they live at the same address
your business partner or one of your attorneys’ business partners
your employee or one of your attorneys’ employees
an owner, manager, director or employee of a care home where you live, or a member of their family
anyone running or working for a trust corporation appointed as an attorney in a financial decisions LPA
