We have had quite a few Australians requesting to go home for family reasons. Each situation is different. A sick family member the best the club can do is try and give them time back in Australia.
Metcalf and his partner having a baby it will be difficult not having immediate family here. The hardest part is the first few years. Their parents will likely come across a fair bit. The best the club can do is try and get a support network around them. Maybe some of the other players partners.
It will always be easier to be near family. My partner and I have just got through it ourselves and sure family were closer than Australia but they still weren't in the immediate area.
These guys are lucky in that they are well paid and can decide to move and another club will likely pick them up.
Let's just hope they both enjoy it in Auckland and Metcalf feels his career is going well here. Fatherhood will soon make you more responsible. So having an extra mouth to feed could mean a more mature player.
I know it is a worry due to past players. Better to worry about it if a request comes. In the meantime congratulations to Metcalf and his partner.