To be worried about her drinking..

[gottabeok]

I've recently had to move back in with my parents with my 2 children following a divorce.
Mum has always liked a glass or wine or 2 but nothing concerning. Over the past few years we've had bereavements in the close family and just a generally shit time.
On a night I've noticed my mums speech becomes slurred. She kindly did my son's nappy last night and was all over the place, trying to throw it in the bin with the lid still down. She swore blind (and on my sons life) she hadn't been drinking and it was her medication she takes.
She admitted this morning she had been drinking brandy - I never even saw her take a drop. This is happening on a regular basis and I'm obviously more aware now I'm living here. I told her I was very disappointed that she lied to me. She's having tests for bowel cancer as she has persistent diarroah (can never spell that)
What do you think?

It doesn't sound good OP, and she can't hide it from you as you are living with her. Have you spoken to your dad? Does he drink with her?

My parents went from 'a glass or two' a night, to a bottle a night plus several whiskies / nightcaps every night over a period of years. It's not uncommon in their age group. I didn't really notice it creeping up tbh: we live o/seas so when we do see them it feels like a holiday, and we all drink more. But they were carrying on like that throughout the year. They weren't proper drunk, it never impacted their lives in any way other than weight gain and my mum being annoying at times (she's quite argumentative anyway, worse when drink has been taken). My sister was far more worried about them as she's generally more health anxious than me.

IDK. Your mum is an adult. What's your relationship with her like? Can you talk to her about these things? My mum was really defensive but she came to a decision herself to pretty much stop drinking because she wanted to lose weight during lockdown (she now has 1 glass of wine with dinner, and drinks coke-without-rum in the evening instead).