It's the second Christmas without my dad this year. It's

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It's the second Christmas without my dad this year. It's taken a toll on my family, especially my mother and brothers. One brother moved away to escape from it, and the other has become a worse alcoholic. My mom has gone a little crazy without him. Even my sister in law cried this morning and said it didn't feel like Christmas without him.
The only reason we had a Christmas last year and this one is for my nieces, being aged six and three.
My boyfriend recently moved in with my family and I. We've had our troubles with him being dishonest about certain things. It has troubled me greatly.
Sometimes I get depressed about things at random times, but my boyfriend doesnt seem to realize when and how to deal with it or help me.
Tldr;
> how do I accept the loss of a parent and help my family?
> how do I talk to my boyfriend about how I feel about it? Without him thinking I'm upset because of him.
> how do I make holidays better without my dad around?