Lucky, lucky girl having two boys! My two fight and compete, but they ADORE each other. They are a mini team, and look after me like you wouldn't believe!
Get him to 'buy' a present for Isaac when they meet for the first time - worked for us!! We also had a choice of two names, and let his big brother choose. Obviously we had to make sure we wouldn't mind either way, but Fin spent the next few months proudly telling anyone who'd listen that "I chose his name!" I'm sure it's why he bonded so quickly with the noisy new thing in the house!
Congratulations - lots of love for the next few months xx