Horror movie about lost kids who fight creatures of green blood (80's or 90's)

A movie, about which I have scattered memories:
A horror movie from 90’s or 80’s, I’m not sure. I was it on TV around 1997 (more or less 2 years). It’s about kids (mostly likely siblings) who get lost in caves, what is interesting is the the green color is very noticed in liquids there, especially from the blood of cave’s creatures.
In the end of the movie they find their parents and successfully leaves the caves, the they prepare a cake at home for a party, when the mom slices the cake we find a green liquid leaks from it and the little sister screams, the the movie ends.

That’s it, exactly. I’ve been searching for ages. Even the AI couldn’t help.

Thank you very much!

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