Maintenance costs on a deceased estate

RAS

Correct, as I hinted above. Just don't think the sister is good at maths, or is perhaps her feelings about the split of the estate blind her to logic?
 
It is also possible someone may have paid a bill from their personal account rather from the estate, rather than waiting for the assets to be realised and the estate covering debts?

So to re-iterate, neither executor should be paying anything from personal accounts. Anyone who has made that error should be re-imbursed that amount and that debt payment recorded in estate accounts. All future debts owed by the estate must be paid from estate funds by the executors, including executor expenses. Only then will the executors know how how much to distribute. 

I assume that they've got some sort of bank account into which the house sale will be paid? And from which the estate debts will be paid. Then they can pay out from the same account.