They are gorgeous dogs, but like I said, I'm biased !
I have known lots of sibes, we did loads of things with ours and met up with lots of other mad sibe owners, and I can honestly tell you I have never seen a sibe be aggressive towards children.
The females tend to be 'mothering' towards children, and the males tend to view children as a mate, someone else to play with !
Males can be huge daft things too, bounding about not knowing that by doing so they could send someone or something flying, but a good owner will teach a pup what is acceptable around people, not just children. The dog should learn there is a time for play, and a time to rest, sort of thing. Like any dog !
All children can be rowdy, and all breeds of dog can have a dog who can be sensitive to loud noises/noise in general, but that is also something that as a responsible owner, the dog should be taught that children playinng and making noise is not something to be scared or fearful of, or react to, in any way.
Most likely as the pup grows into an adult, come the summer months, you may well arrive to pick up your children, to find them sprawled all over the sibe, relaxing in the sun together, or having huge fun playing ball/chase !