Happy Holidays to All Big Paws Family!

Well, Here we are finally two years after losing our Beloved Saint, Cassie, we only had her for two years,and lost her to a bizarre paralysis of her back legs. By the way I am happy to share anything that could be helpful to anyone facing the same or similar.
(You can read the agonizing blogs, but don't do so without tissues)
But onward we go... We are currently looking at a beautiful liter, here in Denver. We were set on knowing we wanted a female, but my husband and I individually picked out the same male. We are now considering bringing TWO into our life. A male and female, brother and sister.
Our questions are for those of you who have two of these amazing dogs,(family members);
Do they bond more to each other rather than us?
How do two (especially brother and sister) get along?
Is training harder with two?
Is it better and do they feel more secure having a constant companion with each other.
My husband and I have no children and are both professionals, it happens that at this moment in time I am currently looking for another job and could spend a tremendous amount of time with them as puppies and his schedule in sales allows for some flexibility. Any thoughts and advise would be welcome. Please feel free to post or give us a call 303-720-5102. Renee & Mark.