<human>: Condense the text into a few key points

So my mum had been out and about socializing recently and She has been making some new friends, my mum mentioned that I fixed Laptops and such to one of them and so they came round to my house to get a repair done.

While I was waiting on a fresh windows install to finish we were sitting talking about my mum. I mentioned that my mum used to be quite the drinker but she's calmed down a lot in recent years. Her friend then turned to me and out of nowhere said, "Well it's not like she's burned your house down or anything". 

It would be good to mention at this point in the story that my mother did in fact burn my house down, when an Argument with my father  got a little heated (No pun intended) some 19 years ago. She served time as a result.

So my response to this was a loud and cheery "Too Late!!" assuming my mum had told her new friend her past and all was good with the world.

"what?" was her friends response?
 Me: "Y'know.. the house... she told you right?"
 Her: "What about it?"
 Me:  "That she uh...burned it down once on a drunken bender".
 Her:  "......"

The laptop is fixed and not much was said after that, her pal wasn't much for talking after that conversation. I ain't heard from my mum but I hope I ain't done any lasting damage to her friendship.. me and my big f'n mouth.
<bot>: Accidentally told mums new friend about the time my mum got drunk and burned our house down so my dad had nowhere to live.