G.B.
I would have a friend take the kids to their activities and go the night before the funeral. That way you can visit some too. Everyone will visit and enjoy the time even though it's a sad occasion.
This is not something odd or unexpected. A lot of times the only time families all come together is when there is a death of one close to them all.
I would also consider just making a couple of days out of it. I know when my older relatives passed away it was a big long deal that lasted several days.