I personally would not do it,,, Reason; I think parents raising lil one may encourage them to have more offsprings.I'm debating pulling it from the parents when it's older to finish handfeeding it so that it's friendly. The parents are pretty skittish and I'd like the baby to not be that way.
Of course you are keeping an eye on lil Junior. I think handling him, may be sufficiently good to keep him on the TAME SIDE. And of course if parents do become deadbeats, and abandon feeding, you can just intervene.