What a shame their owner has died,but luckygoats to have you!!
This is what I do with newbies ......I house them for a while, to get them used to new surroundings, new handler, and also it minimises the risk of them carrying something in to my goats (not that its likely, but you never know). I need to be satisfied that when they are turned out, they are catchable .....nothing worse than a new goat deciding it does not know you, and shooting off. This way they get to know me before being let out. It also gives me a chance to worm them, trim their hooves in necessary etc.
They are then let out with the others, usually put hay or leaves in the field, so there is some distraction. Yes, there will be a bit of confrontation, but once they sort who is boss, they get on fine. Obviously, with kids involved, you do have to keep a close eye, but I am sure Mum will make sure no one touches the little one.