Roch82
PIP is not a means-tested benefit so there savings will have no effect on their payments.
However, if they are receiving any such benefits, such as legacy ESA, UC or Housing Benefit then their savings could have any impact, there is a £6000 limit after which deductions will be made and a £16,000 limit after which entitlement ceases.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems