Aw well I guess it's kind of good to know they missed you? I guess the older ones have got used to having you around more, since DS was born? At least by the time you get this you'll be 2 down and 1 to go
Hope the course is going well too and you're able to not worry too much about them whilst you 're there. Sounds like DH is doing a great job, don't feel bad, I'm sure it's all good bonding time for him and it's just three days