Book series, about two siblings, who go to live with their uncle. The third book in series has something to do with an hwaiin island. The cover of the third one has a raft on it

[Anna]

I can not remember it for the life of me. Its about two siblings, who went to live with their uncle or something. And they have to like go find treasures in the past. The brothers name is Phelix, and in the third or fourth book the uncle fainted and had to go to the hospital. It's a children's fantasy book.

[Alan]

The Time Store series by Andrew Clark The Time Store. The second book of the series is called Phelix.

Your subject title could use some more detail, or the mods will lock it.

[Anna]

No that isn't it the bothers name was Phelix.

[Anna]

Alan wrote: "The Time Store series by Andrew Clark The Time Store. The second book of the series is called Phelix.

Your subject title could use some more detail, or the mods wil..."

No that isn't it sadly

[Rainbowheart]

Are you sure it was spelled Phelix and not Felix?

[Anna]

I honestly can't remember

[Adele]

Here's a guess based on Rainbowheart's insightful question: The Treasure Chest Series by Ann Hood. Siblings Felix and Maisie are the main characters. They move into a house that used to belong to their great aunt, but the great uncle doesn't appear to play a significant role until about book 4: Harry Houdini: Prince of Air