diff --git a/src/IReactions.cs b/src/IReactions.cs
index 01d5668..22fe1fe 100644
--- a/src/IReactions.cs
+++ b/src/IReactions.cs
@@ -21,10 +21,18 @@ public interface IReactions
         /// <remarks>https://getstream.io/activity-feeds/docs/dotnet-csharp/reactions_introduction/?language=csharp</remarks>
         Task<Reaction> AddAsync(string kind, string activityId, string userId, IDictionary<string, object> data = null, IEnumerable<string> targetFeeds = null);
 
+        /// <summary>Adds a new child reaction.</summary>
+        /// <remarks>https://getstream.io/activity-feeds/docs/dotnet-csharp/reactions_introduction/?language=csharp</remarks>
+        Task<Reaction> AddChildAsync(string parentId, string reactionId, string kind, string userId, IDictionary<string, object> data = null, IEnumerable<string> targetFeeds = null);
+
         /// <summary>Adds a new child reaction.</summary>
         /// <remarks>https://getstream.io/activity-feeds/docs/dotnet-csharp/reactions_introduction/?language=csharp</remarks>
         Task<Reaction> AddChildAsync(Reaction parent, string reactionId, string kind, string userId, IDictionary<string, object> data = null, IEnumerable<string> targetFeeds = null);
 
+        /// <summary>Adds a new child reaction.</summary>
+        /// <remarks>https://getstream.io/activity-feeds/docs/dotnet-csharp/reactions_introduction/?language=csharp</remarks>
+        Task<Reaction> AddChildAsync(string parentId, string kind, string userId, IDictionary<string, object> data = null, IEnumerable<string> targetFeeds = null);
+
         /// <summary>Adds a new child reaction.</summary>
         /// <remarks>https://getstream.io/activity-feeds/docs/dotnet-csharp/reactions_introduction/?language=csharp</remarks>
         Task<Reaction> AddChildAsync(Reaction parent, string kind, string userId, IDictionary<string, object> data = null, IEnumerable<string> targetFeeds = null);
diff --git a/src/Reactions.cs b/src/Reactions.cs
index 129c3bf..353ee69 100644
--- a/src/Reactions.cs
+++ b/src/Reactions.cs
@@ -43,10 +43,16 @@ public async Task<Reaction> AddAsync(string reactionId, string kind, string acti
         public async Task<Reaction> AddChildAsync(Reaction parent, string kind, string userId,
             IDictionary<string, object> data = null, IEnumerable<string> targetFeeds = null)
         {
-            return await AddChildAsync(parent, null, kind, userId, data, targetFeeds);
+            return await AddChildAsync(parent.Id, null, kind, userId, data, targetFeeds);
         }
 
-        public async Task<Reaction> AddChildAsync(Reaction parent, string reactionId, string kind, string userId,
+        public async Task<Reaction> AddChildAsync(string parentId, string kind, string userId,
+            IDictionary<string, object> data = null, IEnumerable<string> targetFeeds = null)
+        {
+            return await AddChildAsync(parentId, null, kind, userId, data, targetFeeds);
+        }
+
+        public async Task<Reaction> AddChildAsync(string parentId, string reactionId, string kind, string userId,
             IDictionary<string, object> data = null, IEnumerable<string> targetFeeds = null)
         {
             var r = new Reaction()
@@ -55,13 +61,19 @@ public async Task<Reaction> AddChildAsync(Reaction parent, string reactionId, st
                 Kind = kind,
                 UserId = userId,
                 Data = data,
-                ParentId = parent.Id,
+                ParentId = parentId,
                 TargetFeeds = targetFeeds,
             };
 
             return await AddAsync(r);
         }
 
+        public async Task<Reaction> AddChildAsync(Reaction parent, string reactionId, string kind, string userId,
+            IDictionary<string, object> data = null, IEnumerable<string> targetFeeds = null)
+        {
+            return await AddChildAsync(parent.Id, reactionId, kind, userId, data, targetFeeds);
+        }
+
         public async Task<Reaction> GetAsync(string reactionId)
         {
             var request = _client.BuildAppRequest($"reaction/{reactionId}/", HttpMethod.Get);
diff --git a/tests/ReactionTests.cs b/tests/ReactionTests.cs
index aaffcde..cc9be66 100644
--- a/tests/ReactionTests.cs
+++ b/tests/ReactionTests.cs
@@ -74,7 +74,7 @@ public async Task TestReactions()
             // Add children
             var c1 = await Client.Reactions.AddChildAsync(r, "upvote", "tommy");
             var c2 = await Client.Reactions.AddChildAsync(r, "downvote", "timmy");
-            var c3 = await Client.Reactions.AddChildAsync(r, "upvote", "jimmy");
+            var c3 = await Client.Reactions.AddChildAsync(r.Id, "upvote", "jimmy");
 
             var parent = await Client.Reactions.GetAsync(r.Id);
 
@@ -125,7 +125,7 @@ public async Task TestReactionPagination()
             var r3 = await Client.Reactions.AddAsync("like", activity.Id, "bob", data);
 
             var r4 = await Client.Reactions.AddChildAsync(r3, "upvote", "tom", data);
-            var r5 = await Client.Reactions.AddChildAsync(r3, Guid.NewGuid().ToString(), "upvote", "mary", data);
+            var r5 = await Client.Reactions.AddChildAsync(r3.Id, Guid.NewGuid().ToString(), "upvote", "mary", data);
 
             // activity id
             var filter = ReactionFiltering.Default;
@@ -205,4 +205,4 @@ public async Task TestReactionPagination()
             Assert.AreEqual(r5.UserId, actual.UserId);
         }
     }
-}
\ No newline at end of file
+}