This is difficult for you, but I hope you gain some comfort in knowing that you are working together in the best interests of your kids (at least I assume you are) which is the greatest thing you can do for them.
If you’re one of the younger siblings in the family, you may remember those years when you were the uncle/fairy godfather – you kept the kids happy, you were the extra pair of hands, etc. Or maybe you’re one of the older ones and you remember how great your single siblings were when you needed them. Maybe you can go somewhere where you’ll be needed, you can spend time learning with the kids, peeling vegetables, etc. Right now it seems bleak, but there is a way that you can end off yom tov with a smile.