A YA/Children's Fantasy book about sibling elves being mentored by an old wizard

Describe the plot.

I think the plot was very cliched, but I was quite young and cliches was new to me. I think these twins? were taught about an old wizard in a tower. I think one twin was good at magic. I also think that later in the series they ended up in our world.

Describe notable characters.

Male and female elven twins, think they had some marks on their face.

What genre is it?

Fantasy

Physically describe the book Not very long books, I think they were called something starting on Phant~ But I read them in Norwegian. I don't think they had a Norwegian author. Don't remember much about how it looks.,

When was it set?

Standard Fantasy world

How long was the book?

The first book was not very long..

How old were you when you read it?

I was about 13 so 2003.

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I have searched around some, and I don't think it's either of these:

• Curse of the spider king
• The Alora Chronicles
• Wild Blood

Thanks for any help, sorry about my language, sometimes I make mistakes that I don't notice.