<human>: Give me a shortened version of the text

My girlfriend spent three weeks out of town to do her practical work for school. During that time my mom and sister help out with my daughter during my working hours.

The monday before my girlfriend is to return (that saturday) I get laid off. Stupid low oil prices. 

I find out of town work two days after my layoff notice, so I call my girlfriend and tell her ill be leaving sunday for work. 

So we spend a brief night together saturday and enjoy some of our sunday together (no coitus, her dad AND aunt flo were visiting this particular night) and i leave sunday for work.

Fast forward to today.

At the end of my work day I receive a picture message asking "WHO THE FUCK OWNS THESE?!" accompanied by a pair of brown panties that don't belong to my girlfriend. I am baffled. I have no idea, and tell her as much. Well we all know how reasonable and logical women can be when they become suspicious of infidelity... so I try and talk it out, covering all possibilities. 

Theee women have ever BEEN in our house besides my girlfriend. My sister, my mother, and her mother. 

Her mom hadn't spent the night in a couple months, and neither my mom nor sister have ever spent the night. So I come up with the idea that maybe some of my sisters clothes got mixed up in my daughter's hamper while staying there. 

I text the picture to my sister, and she says they aren't hers. Fucking great, back to square one with an increasingly distrustful and angry girlfriend. About five minutes into my phone call with her my sister call. As it turns out my daughter didn't have a spare change of underwear at my moms so my mother gave her a pair that were too small for herself. 

Still trying to convince my girlfriend I didn't make this shit up.
<bot>: Strange panties were found by my girlfriend in our laundry, turns out that my mom gave her a pair that wouldn't fit herself.