<human>: Can you condense the text into a few key points?

Hey /r/loseit.

I'm going to apologise for yet another stupid question but I'm going to lose weight and I'm going to keep at it this time, and prove myself and everyone else wrong.

Here's my issue -
Most Sunday afternoons, me and my SO go to his mum's house for a roast dinner. Now, I'm tracking my calories, and trying to lose weight solely on a calorie deficit until I can get my hands on a bicycle (our flat is TINY and I'm too much of a wimp to go for walks solo when it's dark) - how would I track what I was being served for dinner? It's my boyfriend's mum - I can't chime in and dictate how dinner should be served, so how would I track this? Pick something from MFP and up the calories to be sure? Try to eat as little as possible during the day?
<bot>: Sorry, I'm new. I need to know how to track calories when you have no idea on portion sizes or method of cooking.