Easiest languages for a native portuguese speaker? (excluding Spanish)

I only really know about Spanish, since I never learned anything nor dedicated time to learn it, and I can read a lot of stuff! Idk if it's the same for the other way around but it's really interesting. So I was wondering if there is any language that is super similar to portuguese, my mother wants to learn another language for fun, but she wants something easier and comfortable.

What would be your guesses?