Whether you decide to tell your kids the truth about Santa when they're 4 or 14, that's up to you. But as people, we need to let parents make those types of decisions for themselves. It's not up to other family members to drop the hard truth on kids, especially ones as young as four years old. Not only is this in poor taste, but it also reeks of entitlement—just because you can, doesn't mean you should.
The original poster (OP) of this story had to kick her sister-in-law out of her house during their Christmas day celebration after she tells the OP's kids that Santa isn't real. The OP's husband didn't think it was a big deal, which only made the OP more angry about the entire situation. Christmas magic is created by super parents like OP, but she wanted to preserve the fantastical element of Christmas for her two young children while they still could. Instead, this sister-in-law found a cozy place on the naughty list for her outlandish behavior.
The original poster (OP) of this story had to kick her sister-in-law out of her house during their Christmas day celebration after she tells the OP's kids that Santa isn't real. The OP's husband didn't think it was a big deal, which only made the OP more angry about the entire situation. Christmas magic is created by super parents like OP, but she wanted to preserve the fantastical element of Christmas for her two young children while they still could. Instead, this sister-in-law found a cozy place on the naughty list for her outlandish behavior.