It can be done with two Includes like this:
var entities = context.Alphas.Include("Bravos.Charlies")
.Include("Bravos.Deltas");
Or this:
var entities = context.Alphas.Include(a => a.Bravos.Select(b => b.Charlies))
.Include(a => a.Bravos.Select(b => b.Deltas));
Obviously First is more elegant.