Jeremy Aster was a young boy orphaned when his mother died on an away mission, who later bonded with Worf as a brother.
Jeremy Aster was a boy living aboard the Enterprise whose father had already died. In The Bonding his mother, Lieutenant Marla Aster, was killed by an ancient mine while on an away team led by Worf, leaving him alone.
An energy being from the planet then appeared to Jeremy in the form of his mother, recreating his home and offering to care for him. The crew helped him see that he had to face his loss. Worf, who had also been orphaned, performed the Klingon R'uustai bonding ritual with him, making them brothers. Gabriel Damon played him.