Merry Christmas, Gramps

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1.
It's cold here
2.
Closely related to #1—this one will help Grandma's 35-across
3.
Why you were up north
4.
Also why you were up north
5.
A big ship, now sleeping
6.
Where summer happened
7.
Where hand-offs occurred
8.
It takes worms and #6
9.
Making cars for...
10.
Where it began
11.
I famously dislike her
12.
The youngest—usurped by #11
13.
A big fan
14.
Thank her for #11
15.
The oldest, with the previous three
16.
The oldest, with the next two
17.
The middle
18.
The youngest, but not like #11
19.
What brought us here
20.
Why this puzzle exists