Congratulations!!! I think, I am just kidding. We brought Diego home 2 weeks ago and there was a transition. They are both males. Rico is 1 yr and 4 months and Diego is 6 months old. they have already established that Rico is the boss. It has been tough at times especially the potty pad thing. I thought Rico would show him the ropes. But, I think Rico purposly is not showing Diego, so Diego can get into trouble.
But when all said and done, Rico enjoys playing with his brother and to see the 2 of them know is great. We caught them sleeping together in the same bed

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Anyway, it takes patience, but well worth every minute.
Wishing all the best on your new addition. And a Very Merry Christmas.