It'll be fine. Emmett will remember who Mum is. He may give you a hard time for a few hours -- just to show you who's boss, and that you mustn't make a habit of this going away nonsense.
When we're away for a few days, there's always one (of three) on hand to make sure that we're not a figment of their imagination when we arrive home, and almost immediately, that one goes out for a few minutes and then comes home. The others take longer to show up. It seems like "Yeah, they're home -- don't make too much fuss or they'll think it's ok to go away."
My old lady, Shasta, was the one for teaching me a lesson. One time in particular was quite amusing, actually. This was while Rob and I were still sharing two households. She knew him well, and while I was away for a couple of weeks, he and my landlord shared visitation/feeding duties. When I got home, Rob picked me up at the airport around supper time and took me home. I opened the door, Shasta was there, she pointedly acknowledged my presence without fuss, and then went to Rob and fussed just as pointedly over him. She followed him around, rubbing and purring and loving him up -- and completely and thoroughly ignored me -- for the rest of the evening. "Oh. So you decided to come home, did you? Well, I know who MY friends are!" She was fine the next day -- back to her usual mushin' with Mum self.
I love a critter with the self esteem to give me a hard time when she thinks I need to be taught a lesson!