If there are many people living in the house puppy eventually will choose a main master, however, you can help him. Besides feeding, walking, training etc which will make him lean towards one person or another, you can give puppy your sock. Take nice long athletic sock, wear it (go for a nice hike, play a game etc), goal is making it nice and stinky. Then tie it in a knot and give it to puppy, put on his bed. Your feet have the strongest smell of you, and when puppy misses you he can chew on the sock instead of your expensive leather shoes or those nice sneakers. As alternative you can gather socks from everyone in the family, then puppy can choose for himself. Whatever the case it will help with anxiety when puppy is left home by himself.