I'm looking for a cartoon where a brother and his sister were stuck and lost in a cave with trolls and they couldn't get out. There was something with a golden hemp or rope and with that rope they could find each other. (I can't think of any other think, it would be nice if someone could help me.)

Sounds like,

The Princess and the Goblin

The girl and boy weren't siblings though
They were a princess and a humble miner's
Son. Also the villains were goblins not trolls

sounds like,

the princes and the goblin

the girl and boy weren't siblings though
they were a princess and a humble miner's
son. Also they villains were goblins not trolls

Thank you a lot!!