2 files changed, 8 insertions, 0 deletions
diff --git a/src/interfaces/chain.cpp b/src/interfaces/chain.cpp
index 8c5921970..d7bad0543 100644
--- a/src/interfaces/chain.cpp
+++ b/src/interfaces/chain.cpp
@@ -196,6 +196,10 @@ public:
         auto it_mp = ::mempool.mapTx.find(txid);
         return it_mp != ::mempool.mapTx.end() && it_mp->GetCountWithDescendants() > 1;
     }
+    void getTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants) override
+    {
+        ::mempool.GetTransactionAncestry(txid, ancestors, descendants);
+    }
 };
 
 } // namespace
diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index aa4f17a8e..33bbfefd9 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -9,6 +9,7 @@
 #include <policy/rbf.h>             // For RBFTransactionState
 
 #include <memory>
+#include <stddef.h>
 #include <stdint.h>
 #include <string>
 #include <vector>
@@ -138,6 +139,9 @@ public:
 
     //! Check if transaction has descendants in mempool.
     virtual bool hasDescendantsInMempool(const uint256& txid) = 0;
+
+    //! Calculate mempool ancestor and descendant counts for the given transaction.
+    virtual void getTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants) = 0;
 };
 
 //! Interface to let node manage chain clients (wallets, or maybe tools for