when will my 8 month old get used to ppl?

My 8 month old son won't let ANYONE hold him accept me, his dad, both grandmas & my little sister. When will he get comfortable w everyone else? It's so hard for things to get done bc it's not like we can drop him off at a family's member for a few hours. He'll give them a hard time! I know he's still young but it's getting cold & we're in the process of moving but can't since he won't let ANYONE hold him n I'm going nuts bc I need to get out of my mother in laws apartment ASAP. Can't stay here any longer