<human>: Can you succinctly summarize the text in 1-3 sentences?

Hello, so my father this year volunteered to work on Thanksgiving, he didn't have any part of it, my mother and I just decided to do nothing. This Christmas my brother and his pregnant wife have decided to come for Christmas, for just less than a week. My father told my mother and I he's volunteering to work both days... She freaked out, and I got pretty upset.  Just FYI. We're not in financial troubles, we're doing well. He could have volunteered multiple times every week, but for some reason he's decided for the holidays.  I don't know why, but he's pretty much cut himself off from his other relatives, and maby he's just giving them an excuse to why he's not going possibly?

He cheated on my mother a few years ago, we don't suspect he's doing it now, there are no signs and he broke it off with her..  He used to have a pill addiction, he said it's over now....

When we asked him he just told us '' for the money '' and not to bother us. He's never done this before.... and we've also never been this financially stable... I don't know what's wrong, and I know there are tons more variables, so ask and I will answer. Thank you. 

Also, our family is pretty close, there's no bad blood, and it'd absolutely break my brother and his wifes heart if they find out that my dad has skipped out on us to '' volunteer '' for two days on xmas and xmas eve, they also live across the country so this is a big deal for them to come.
<bot>: Father is volunteering xmas + eve for no reason, family is visiting just for xmas..  just me and my mother here.