We are planning our first trip to WDW in October.  My dh, myself, and two dd's who are 3 and 5.  Also joining us is my sil and nephew, who is 11.  We are staying offsit at a Premier Home.  Will it be a big hassle to drop them off at a different park like MGM and then us proceed to MK?  Or would it be better, say, for us all to go and park at MK and then them catch a bus or something to a different park?