Will you take working gigs on major holidays?

I just received a request to work on Thanksgiving this year.  It's legit as I've done 2 other sessions for this client (their wedding and maternity session).  The husbands parents are not doing well, and they are having a family reunion Thanksgiving and want the day to be photographed. 

Would you take this job and how would you charge for this?  They have requested I be there from 12pm noon, till 10pm. 

I used to take "paying" gigs anytime.... YMMV.
It matters not how someone else would charge for it, you have your rates, use them....

Think "wedding". A full day rate, plus a kicker for the holiday. Much depends upon deliverables. Maybe a book, and everyone at the reunion wants one?

I don't work holidays.  To few, and more important to spend with my kids

Full day gigs?  NO.  

Something like 4-6 hours early in day, perhaps if it was the right gig.  I would charge accordingly as well. Would want to make sure it's worth my time.  

Nope, holidays I keep off for family

It would have to be a crazy paid session in order for me to give up a holiday with my family.  I'm not saying no, but will say there would be a an impressive premium added.

+1 Yep, I'm with you

I don't have to do this sort of work so no, I wouldn't! But since you did the client's wedding and maternity photos and know them and realize the circumstances, if they really want you to do this and you're considering it, try discussing options.

I've done events and I don't see a need to be there for 10 hours, and I'm wondering is that because they want to make sure you get 'everybody'? Maybe figure out a way to do that, find out who are the significant people they particularly want photographed (and get everyone else you can). What's the time frame for the day?  Maybe you could go at 11:30 to get early arrivals for lunchtime, leave at whatever time (mid afternoon?), come back after you have an early dinner with your family (by 6:30ish?) to get guests who came late afternoon for dinner/dessert.

If the parents haven't been in the best health, would they even be there til 10? Maybe you could finish up by 8:30 or so. Work maybe 3 hours or so, leave and come back for another 2 hours or so. Or maybe you could get everybody by 4ish and be done for the day. Or if you can't work it out, you may need to decline.

Get on asmp.org or PPA to find the pricing guidelines (both pro organizations link to the same resource). I'd probably be looking at establishing holiday rates. To me that ought to be maybe twice the usual rates? (I don't know other photographers who work holidays.) I would think for some lesser holidays the rates may not be much more than usual but for major holidays I would think so.

But you don't have to do this, if you don't then help the client understand that you want to spend the holiday with your family.