<human>: As many other TIFUs, this didn't happen today, but actually on last Christmas. My family is having a party and we invite some family friends, and some of them happen to be three small children aged 5,7, and 9. So they are relatively young.

I'm playing a video game with these three in the room, and I happen to be in a phase with my friends where we instinctively say "Your mother" jokes to each other. Well, I lose the game I'm playing and one of the kids laughs at me and says I suck. My immediate reaction to him is to say "Your mom sucks." Everyone in the room goes silent.

I instantly realize my FU. Their mother had cheated on their father and abandoned their family a few years back. I immediately make an ass of myself and try to correct things by saying "I DIDN'T MEAN YOUR MOTHER, I MEANT......MY MOTHER." Things just got hella awkward with a bunch of stares.

Tell my friend what happened a few days later and he responds "At least you said sorry." Shit. I realized I never apologized.

Can you condense the text into a few key points?
<bot>: Said "your mother" to kids who's mom abandoned them, tried to fix it but made it worse, never apologized