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Is there potentially an argument brewing, or are you just wanting to know if one can refrain from acting if they decide to do so?
my brother wants to buy the house which is fine. but it seems one of my sisters has had the house valued and not said anything to the other is that allowed. also how many agents should value the house and which value do u go with. the agent that has valued it at the moment is my brother so it doesn't seem right
On the basis that Probate has been granted to both sisters, both have to act and agree together on everything concerning the Estate. Hence, if the house is to be sold, both sisters should obtain 3 impartial valuations and the middle valued one be used.
Your sisters owe a duty of care to all the beneficiaries, so the valuation from your brother should be disregarded straight away, and 3 independent valuations be obtained.
If it is more practical for your one sister to deal with these valuations, then that is fine, provided your other sister is notified of the valuations and agrees to proceed with the middle valuation.
I hope this assists and sets out the legal position.