Oops, didn't mean to press post 
You say you mostly work from home but can you do that and toilet train a puppy at the same time? What will they do while you're working? And what happens if you do have to go into the office?
Can you afford all the related costs - holiday care (kennels aren't cheap), a dog walker if you're away all day, vet bills, food, flea and worm medication, insurance, leads, coats, collars, toys, chews, bowls etc?
I'm not by any means saying "don't do it" but I think you'll find you end up spending most of your summer break up at home with the puppy as they're too young to be walking for hours and will need lots of chances to rest and sleep.
Just be aware of what you're taking on and don't rely on anything your DC say when it comes to caring for it! If they do step up, fantastic, but there's thread after thread on here from overwhelmed owners whose DC (and DH!) have promised to do "everything" yet after a week they're bored and OP is left to do it all.