Q. If the chasuna is on Chanukah and the choson leaves his parents home for good, before sunset and goes to his wedding hall and then later that night will move in to his new home, where should he light Ner Chanukah?

A. Halichos Shlomo (Chanuka p. 275) and Nitey Gavriel (Chanuka 11: 4) rule that a groom that leaves home after the time of kindling the menorah, should not light in the new home where he is to spend the night with his bride after the wedding, but in the house of his parents. They rationalize that at the time of the hadlaka, his parents home is still his home and that is where he has to light. Halichos Shlomo debates if he has to remain a half an hour after lighting there before he moves out; and compares this to one selling his home after lighting the menorah or a visitor returning home on Motzei Shabbos. Horav Shlomo Miller’s Shlit’a opinion is that the half an hour stay is unnecessary.
If he left the parental home before shekiah, Halichos Shlomo (Orchos Halocho ibid. n. 47) rules that he should light the menorah at his new location. He advises to take some time-out before the seuda begins and light at his new abode.
Horav Shlomo Miller’s Shlit’a opinion is also that in your case since the choson left his parental home before sunset, he should light the menorah at his new location.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a