Dog growls when other people go near his bone but not me

Okk so im 15f and I have 3 other sisters. Im the second oldest ana 18f is the oldest, ta f13 is the thid and ja is the youngest 9f. My dog Isaiah is a husky/lab mix, and my gigi got him a huge bone for Christmas. When my sister's or parents get close he would growl at them. But when I go near, he doesn't care. He would show it to me, give it to me, and even let me take it. Heck he waits for me to sit down to eat it on me or next to me. When im near he usually stops growling at the other person. For context my big sister has been to college and is here for the holidays.so he's been on edge with her a bit. ta will usually get him riled up and when he nips/bodyslams/and barks she will correct him by hitting him. She doesn't hit him so much but still riled him up. She dose this when shes bored. All my sisters disregard his warning like him growling or just being uncomfortable. Especially ja. I have to basically scream at her to get away from him when he's LITERALLY GROWLING. Now I when I was 14/13 I was ignorant. I would hit him when he destroyed something or when I was walking him and he would jump up and nip my sleeves on my coat cause ta would hit him with it however i still was the one that mostly fed him and give him water and play with him. My parents didn't really care. Didn't train him and didn't bother to learn. This year things changed when I dislocated my knee and needed surgery. During that time I reflected and decided that what I was doing wasn't working and started looking up dog training videos. For the last five months I have been taking him on regular walks and one extra long walk. I started training him, using towls and peanut butter for a sniff mat of shorts, when we didn't have treats I would make them(they were surprisingly), I got him treatment for a Hotspot that was bothering him and I brush and cut his nails. reacting to things which I reward him for it. I dont understand the resource guarding to other people but me. I used to do bad things to him. He should hate me. I don't think I deserve it. Thanks for getting this far and even more