Have your friend made contact with multiples association of south africa? Friends of ours had triplets and found a lot of support there. People who have been through this have developed some helpful tactics to align feeding and sleeping routines from what I have heard.
A dear friend of mine have twins – almost 2 months old now. As you could imagine, feeding the twins @ 1 am and 4 am is already a challenge. To make it worse, they make turns to have a suicide hour every evening. From about 12:00 – 4:00 one of them are reluctant to sleep and will cry non-stop.