The typical action to take in your situation would be to accept & pay that portion of the claim that you believe to be valid & to reject the balance of the claim, forcing the creditor to file suit against you, as PR, within 30 days, for allowance of the rejected portion of the claim. If you want to reject a claim or any portion of it, please reread the relevant statutes, as you have to follow them precisely or your rejection will be invalid (meaning that you may lose the 30-day bar if they don't timely file suit). Please don't try to make up your own process with this. If you want to do a rejection, follow the statutes & do it right the first time. If you believe the claim might be wrong or will be paid by another, don't pay it until those issues are resolved.
Richard Wills, WSBA 19720