Fantastic news. Congratulations.
Speaking from experience of two puppies (only 4 months difference in age), it is hard work......but it is gonna be worth it in the end. They play really well together.....collapse together when exhausted....and recently have begun giving a wonderfully harmonious Woo Woooooing wolf type noise. Don't know what all that is about really, but there is no aggression at all.
Hardest part in my opinion is the sleep patterns.....one is just settled, and sleeps well in his basket in the kitchen....but the other still wakes and disturbs him. We tried separation, but that was worse....both howled. So, little by little we are praying for a good nights sleep eventually.