You're welcome Lynn, anything that might help.
I have to agree with your sis though as I like milk but wouldn't drink those. Ex-hubby used to have 6 a day at one point and Mum had them but struggled with them as they are quite sicky, bleugh.
You can also get something called maxijoule, which is an energy powder you can mix with a drink, so grapefruit squash with it might be nice for your Sis?

Lynn, I'm sorry I've only just caught up with this thread, I can see you've had a lot of good advice from people who know all about the awful time your sister, your mum and you and Gorden are going through.

I'm afraid I'm no good in respect of offering any advice but I'm thinking about you all and wish you the very best of luck in getting your sister well enough for the next stage of her treatment.

Sheree xx