I'm not sure about Aus but here in the UK the FDC's children don't "count" so you could have 2 under 12 months if one was your own.

I think it depends on the person really. I know women who are quite capable of ignoring children however old or distressed they are, and a woman who is bringing up non-identical triplets ON HER OWN without ever having to ignore any of them. It just depends on her personality. I would FDC 2 under 12 months, but i am a confident and frequent baby-wearer so i wouldn't feel i was having to "go" to them. If one got upset i'd stick them in the wrap for a bit and if both got upset i'd stick one on each hip/one front, one back until they'd calmed down.

If you're not comfy with the idea then don't interview her, but if you're just concerned it might be worth talking to her about how SHE deals with it, and get a feel for her. My mum did FDC when i was a kid and had 4 of us at one time, me (26 mos), little girl#1 (16mos), little girl#2 (6mos) and baby girl (6 weeks). She'd had 3 boys in 3 years when she was younger and she coped fine with us all. She had constant "activities" on the go for us older 2, and kept the littly in a wrap most of the time. At nappy time she changed us all from smallest to biggest at the same time. There was a waiting list for her care as parents were always so impressed come hometime at their kids lined up, relatively clean, well-fed, and with a bunch of pasta pictures, finger paintings, autumn leaf collages etc. for the fridge.

Really, if people have twins and triplets it is obviously possible to care for more than one at the same time, you just need to do what YOU feel comfortable with as regards her care and your kid.

Bx