What is the name of this cartoon movie?

Very curious

New member
When I was younger I saw this cartoon movie about a brother and sister
who went to some sort of light house where an old guy lived. Then they
somehow got turned into fish and had this big adventure under the sea.
I don't remember much else excpet that there was this storm at the end
and then they turned back into humans. It was really enjoyable for me to watch. Has anyone
else heard of this movie? I would really like to show my younger sibling the cartoon
because he's been asking to see it for a long time now. The problem is, that
I don't remember what the movie is called. If anyone can help me out here it would be
much appreciated.
 
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