@Fantasmic143 there is so much to do here! I really like LA but feel you have to know people who live here and not try to just do universal and Disney and Hollywood in a day to appreciate it.
The weather is always fairly mild, we rarely dip below 12/13 degrees and in the winter tend to hover around 15/16 (its a lot colder in the Valley to the north though) but then we have the odd heatwave where it goes up into the 20’s. I would just bring layers- the rain doesn’t tend to start until the new year. Layers are also important because the city acts like it’s hot all year round so there’s still air conditioning in shops and restaurants and rarely heating!
Do you have DC? What do you like to do? There are so many beautiful hikes, amazing galleries and museums, so much good food, excellent flea and farmers markets, tiny art house cinemas everywhere, the city is made up of a million little cities so you can feel like you’re in chichi white washed surburbia one minute and the heart of Mexico in another.
America does Christmas really well - LA has a myriad of boat parades and areas known as Candy Cane Lane where all the houses decorate to extreme amounts. I love the holiday season here! And the ocean tends to be quite calm in December, obviously we have a ton of beaches.
I highly recommend hiring a car and also not going to Hollywood - it’s a shit hole and not worth going just to see the stars on the boulevard and get accosted by a drunk dressed up in a Spider-Man outfit he’s worn since 1963.
Let me know your family dynamic and what you like to do and I’ll come up with some more specific suggestions.