Just a couple of my own observations having raised ours exactly one year apart in age.
1) Thats normal, esecially if its high value food or toy. We feed our seperately if its high value, otherwise the Alpha misbehaves...
2) She will probably bully him up until 8 months. He will go along with it or hide until he is big enough to do something about it, then they might have it out. Watch for it, and make sure they don't hurt each other. The first time it happened to us, I split them up, the second time I caught it too late and the bully was on his back (unhurt) saying, yes sir to the new Alpha.
3) Girls (in this breed anyway) are smarter than the boys. They will never forget! With the boys its kinda over 5 minutes later. The girls may wait 5 months before they find an opportunity for revenge, and then a sneak attack.
4) I bet they will be the best of friends. The boys kinda like to be bossed around by the girls, as long as it's not too much.
I bet he looks like Helena, his grandma, when he get older. Kristina at Sierras owns her.