Can a will be challenged on the basis that one party gave unpaid care prior to death?

[ColinK]

A will is in place with equal shares going to 4 siblings.
Between 3 and 10 years prior to death one sibling willingly moved in to care for the parent - without specifying any conditions (eg payment or that person should be replaced by another sibling in the future).
Lets assume 2 scenarios:
The person who moved in to give care gave up their job and lived of the income of the person being cared for (with no carer's allowance) + their own personal savings.
The person was self employed and lived of the income of the person being cared for (with no carer's allowance) + their own personal savings. (Their self employment continued but obviously at reduced potential income due to the hours given in care).

Could either of the above circumstances justify a successful challenge to the will so that they should receive "income" for the care provided, before any disbursement of the estate?

Thanks

[ColinK]

Does anyone have an opinion on this?

[des8]

IMO the grounds you explain are not sufficient to contest the will, altho' "the person[s]" may be able to make a claim under the Inheritance (provision for family and dependants) Act 1975.
They will probably require professional advice from a solicitor specialising in contentious probate.

If beneficiaries agree the will can be varied to reflect the situation

[EnglandPi]

The chances of successfully contesting / challenging a will are slim and expensive.

[ColinK]

Thanks to @DES8 and @ENGLANDPI

I assumed that it would be difficult to change a will in the given scenario. Thanks for the opinions.

ColinK